Please answer number 7 I give brainliest thank you!

Answer:

0.43.

Step-by-step explanation:

The probability that the customer will pay with debit card = 50%

The percentage of customers who use coupons 30% and  35% pay with debit card.

Now calculate the probability  that the same person will use coupon:

P[Uses coupons | Pays with Debit card] = P[Uses coupons and pays with debit card] / P[ Pays with debit card]

= 0.3 * 0.5 / 0.35

= 3/7  or  0.4286 or 42.86%

Answer:

3/7

Step-by-step explanation:

There are 7 possible outcomes on this spinner. There are 3 odd numbers, so your odds of landing on odds is 3/7.

Answer:

3/7 chance

Step-by-step explanation:

There are 3 odd numbers on the spinner.

There are 7 total numbers.

This means there is a 3/7 chance you spin an odd number.

Answer:

The probability that an 18-year-old man selected at random is greater than 65 inches tall is 0.8413.

Step-by-step explanation:

We are given that the heights of 18-year-old men are approximately normally distributed with mean 68 inches and a standard deviation of 3 inches.

Let X = heights of 18-year-old men.

So, X ~ Normal([tex]\mu=68,\sigma^{2} =3^{2}[/tex])

The z-score probability distribution for the normal distribution is given by;

                              Z  =  [tex]\frac{X-\mu}{\sigma}[/tex]  ~ N(0,1)

where, [tex]\mu[/tex] = mean height = 68 inches

           [tex]\sigma[/tex] = standard deviation = 3 inches

Now, the probability that an 18-year-old man selected at random is greater than 65 inches tall is given by = P(X > 65 inches)

       P(X > 65 inches) = P( [tex]\frac{X-\mu}{\sigma}[/tex] > [tex]\frac{65-68}{3}[/tex] ) = P(Z > -1) = P(Z < 1)

                                                                = 0.8413

The above probability is calculated by looking at the value of x = 1 in the z table which has an area of 0.8413.

Answer: 6 and -1/6

Step-by-step explanation:

solving for y. You get y = -2x +5, so the slope is –2. Perpendicular lines have opposite-reciprocal slopes, so the slope of the line we want to find is 1/2. Plugging in the point given into the equation y = 1/2x + b and solving for b, we get b = 6.

Answer:

1) 2

2) -1/2

Step-by-step explanation:

1) 3y= 6x+9

y= 2x+3

Slope is 2

Parallel line "t" has the same slope, it will have equation:

y= 2x+b

2) y =2x+3

Perpendicular line"r" has a slope opposite-reciprocal to this, so the slope will be -1/2, the equation for line"r" is:

y= -1/2x +b

The gradient of the line is same as slope and it is -1/2 for line"r"

Answer:

h = -25

Step-by-step explanation:

h + 20 = 35 - 40​

Add 35 and -40.

h + 20 = 35 + - 40​

h + 20 = -5

Subtract 20 on both sides of the equation.

h + 20 - 20 = -5 - 20

h = - 5 - 20

h = -25

The value of h in the equation is -25.

Answer:

a) P = 0.039

b) The expected number of days is 10 days.

Step-by-step explanation:

The most appropiate distribution to use in this case is the geometric distribution, in order to calculate the probability of a success after k failure trials.

The probability of success, as each of the 10 products are assumed to have fair probabilities, is:

[tex]p=1/10=0.1[/tex]

Then, the probability that our product is not selected any given day is:

[tex]q=1-p=1-0.1=0.9[/tex]

a) The probability that exactly this product is selected exactly 10 days from now is the probability that is not selected (probbility q) for the next 9 days and selected (probability p) at the 10th day:

[tex]P=q^9p^1=0.9^9\cdot0.1=0.3874\cdot0.1=0.039[/tex]

b) The expected number of days is calculated as:

[tex]E(X)=\dfrac{1}{p}=\dfrac{1}{0.1}=10[/tex]

Answer:

The general formula for the total surface area of a regular pyramid is T. S. A. =12pl+B where p represents the perimeter of the base, l the slant height and B the area of the base.

Answer:

the total surface area of a regular pyramid is T. S. A. =12pl+B where p represents the perimeter of the base, l the slant height and B the area of the base.

Answer:

.1919

Step-by-step explanation:

Answer:

Step-by-step explanation:

Adding the two together 1212 + (99 - 1)

1310

1212/1310 = 606/655

Decimal: 0.9252

I'm always happy to help :)

Answer:

? = 5

Step-by-step explanation:

Parallel lines are made with 2 lines having the same slope but different y-intercept.

Answer:

5

Step-by-step explanation:

Parallel lines have same slope

y= 5x+2

y= 5x+3

Answer:

see below

Step-by-step explanation:

y = -sqrt(x) +1

We know that the domain is from 0 to infinity

The range is from 1 to negative infinity

Answer:

b

Step-by-step explanation:

e2020

Answer: B. false

Step-by-step explanation:

An equilateral triangle has 3 equal sides

Isosceles triangle has two equal sides.

Which means that equilateral triangles cannot become isosceles.

Answer:

False

Step-by-step explanation:

An equilateral triangle has all three sides equal

An isosceles triangle has at least 2 sides equal

An equilateral triangle is a special isosceles triangle

area =πr²

6.5²xπ=132.73

2.3²xπ=16.62

132.73-16.62= 116.11

116cm^2

i think its this anyway

Answer:

116 cm^2 to 3 s f's.

Step-by-step explanation:

The area of the shaded part = area of the outer circle - area of the inner circle

= π * 6.5^2 - π *  2.3^2

=  132.732 - 16.619

= 116.113  cm^2.

Answer:

[tex]A(t)=300-290e^{-\frac{t}{60}}[/tex]

Step-by-step explanation:

The volume of fluid in the tank = 300 Liters

Initial amount of Salt in the tank, A(0)=10 grams

Change in the Amount of Salt in the Tank

[tex]\dfrac{dA}{dt}=R_{in}-R_{out}[/tex]

Rate In =(concentration of salt in inflow)(input rate of brine)

[tex]R_{in}=(1\frac{gram}{L})( 5\frac{L}{min})=5\frac{grams}{min}[/tex]

Rate Out =(concentration of salt in outflow)(output rate of brine)

[tex]R_{out}=(\frac{A(t)}{300})( 5\frac{L}{min})=\frac{A(t)}{60}[/tex]

Therefore:

[tex]\dfrac{dA}{dt}=5-\dfrac{A(t)}{60}\\$Rearranging, we have:\\\dfrac{dA}{dt}+\dfrac{A(t)}{60}=5[/tex]

We solve the resulting linear differential equation for A(t)

[tex]\text{The integrating factor: } e^{\int \frac{1}{60}dt} =e^{\frac{t}{60}}\\$Multiplying by the integrating factor all through\\\dfrac{dA}{dt}e^{\frac{t}{60}}+\dfrac{A}{60}e^{\frac{t}{60}}=5e^{\frac{t}{60}}\\(Ae^{\frac{t}{60}})'=5e^{\frac{t}{60}}[/tex]

Taking the integral of both sides

[tex]\int(Ae^{\frac{t}{60}})'=\int 5e^{\frac{t}{60}} dt\\Ae^{\frac{t}{60}}=5*60e^{\frac{t}{60}}+C, $(C a constant of integration)\\Ae^{\frac{t}{60}}=300e^{\frac{t}{60}}+C\\$Divide all through by e^{\frac{t}{60}}\\A(t)=300+Ce^{-\frac{t}{60}}[/tex]

Recall that when t=0, A(t)=10 grams (our initial condition)

[tex]10=300+Ce^{-\frac{0}{60}}\\10-300=Ce^0\\C=-290[/tex]

Therefore, the number A(t) of grams of salt in the tank at time t is:

[tex]A(t)=300-290e^{-\frac{t}{60}}[/tex]

Answer:

[tex] Range = Max -Min[/tex]

[tex]Range= 42-10.5= 31.5[/tex]

The sample variance would be given by;

[tex] s^2=\frac{\sum_{i=1}^n (X_i -\bar X)^2}{n-1}[/tex]

And replacing we got:

[tex] s^2 = 161.377[/tex]

The standard deviation would be:

[tex]s=\sqrt{161.367}=12.703[/tex]

Step-by-step explanation:

For this case we have the following data:

42 40 39 31 22 18 15 12 11.7 10.5

If we sort the values on increasing order we got:

10.5 11.7 12.0 15.0 18.0 22.0 31.0 39.0 40.0 42.0

The range is defined as:

[tex] Range = Max -Min[/tex]

[tex]Range= 42-10.5= 31.5[/tex]

The sample variance would be given by;

[tex] s^2=\frac{\sum_{i=1}^n (X_i -\bar X)^2}{n-1}[/tex]

And replacing we got:

[tex] s^2 = 161.377[/tex]

The standard deviation would be:

[tex]s=\sqrt{161.367}=12.703[/tex]

Answer:

Sammy's course is 3.19 mph at a heading of 322.36°

Step-by-step explanation:

To solve this problem we need to calculate a sum of vectors.

We can calculate this sum decomposing both vectors in their horizontal and vertical component, and then we sum the components:

First vector: module 5, direction 310°

[tex]horizontal\ component: 5 * cos(310) = 3.2139[/tex]

[tex]vertical\ component: 5 * sin(310) = -3.8302[/tex]

Second vector: module 2, direction 110°

[tex]horizontal\ component: 2 * cos(110) = -0.6840[/tex]

[tex]vertical\ component: 2 * sin(110) = 1.8794[/tex]

Resultant vector:

[tex]horizontal\ component: 3.2139 - 0.6840 = 2.5299[/tex]

[tex]vertical\ component: -3.8302 + 1.8794 = -1.9508[/tex]

Now, to go back to the polar form, we can use the following procedure:

[tex]module = \sqrt{horizontal\ component^2 + vertical\ component^2 }[/tex]

[tex]module = \sqrt{2.5299^2 + (-1.9508)^2 }[/tex]

[tex]module = 3.1947[/tex]

[tex]angle = arc tangent(vertical\ component / horizontal\ component)[/tex]

[tex]angle = arc tangent(-1.9508 / 2.5299)[/tex]

[tex]angle = 322.36\°[/tex]

So Sammy's course is 3.19 mph at a heading of 322.36°

Answer:

The answer is table A.

Step-by-step explanation:

Just took the test.

Correct if I'm wrong!

Tisa B Sora

The linear equation A) y = 3x + 5  has the same y-intercept as the one that is represented by the graph.

The standard form of equation of a line is ax + by + c = 0. Here a, b, are the coefficients, x, y are the variables, and c is the constant term. It is an equation of degree one, with variables x and y. The values of x and y represent the coordinates of the point on the line represented in the coordinate plane.

The equation of line based on the coordinates given: [tex]y - y1 = (\frac{y2 - y1}{x2 - x1} )(x - x1)[/tex]

A.

[tex]y - 2 = (\frac{-4-2}{-3+1}) (x + 1)\\\\y -2 = 3(x+1)\\\\y - 2 = 3x + 3\\\\y = 3x + 5[/tex]

B.

[tex]y - 6 = (\frac{-2-6}{4-2}) (x -4)\\\\y -6 = -4(x-4)\\\\y - 6 = -4x + 16\\\\y = -4x + 22[/tex]

C.

[tex]y - 5 = (\frac{5-1}{5-3}) (x -5)\\\\y -5 = 2(x-5)\\\\y - 5 = 2x -10\\\\y = 2x -5[/tex]

D.

[tex]y - 46 = (\frac{46-34}{6-4}) (x -34)\\\\y -46 = 6(x-34)\\\\y - 46 = 6x + 68\\\\y = 6x + 114[/tex]

The solution set which matches the graph must also contain the coordinate that lie on the line i.e., (0,5).

So, we check equation of which line satisfy the given coordinate (0,5).

It is A). It must have the same y-intercept as the one that is represented by the graph.

Learn more about equation of line here

https://brainly.com/question/21511618

#SPJ2

Answer:

[tex]\boxed{ \ x = 2 \ or \ x = -2 \ }[/tex]

Step-by-step explanation:

I understand that you want to solve this equation

[tex]\sqrt{x+2}\sqrt{x-2}=0[/tex]

<=>

[tex]\sqrt{(x+2)(x-2)}=0[/tex]

<=>

[tex](x+2)(x-2)=0[/tex]

<=>

x = 2 or x = -2

hope this helps

if your question is [tex](\sqrt{x}+2)(\sqrt{x}-2) = 0[/tex]

then this is [tex](\sqrt{x})^2-4 = 0\\<=> x = 4[/tex]

Answer:

2535cm

Step-by-step explanation:

Area of a parallelogram is found by the equation A=bh

65cm is the base and 0.39m is equal to 39 cm, so 65 times 39 is 2535

Answer:

$37.50

Step-by-step explanation:

50*.25=12.50

Take $50 - 12.50  = 37.50

[tex]answer \\ - \frac{5}{7} \\ please \: see \: the \: attached \: picture \: for \: full \: solution \\ hope \: it \: helps[/tex]

Step-by-step explanation:

initial speed = 272 ft/s

h = -16t² + 272t

a. 1120 = -16t² + 272t we change a bit into

16t² - 272t + 1120 = 0 then divide all with factor 16

t² - 17t + 70 = 0

(t - 10)(t - 7) = 0

t = 10 and t = 7

7 s when it goes up and 10 sec when the rocket goes down.

b. 1152 = -16t² + 272t we change a bit into

16t² - 272t + 1152 = 0 then divide all with factor 16

t² - 17t + 72 = 0

(t - 9)(t - 8) = 0

t = 9 and t = 8 sec

c. since the answer of a and b is:

7 sec and 8 sec the rocket goes up but at 9 sec and 10 sec the rocket goes down then we can take conclusion that the maximum height is reached at 8.5 s

so how long the rocket in the air?

goes up : 8.5 sec

goes down : 8.5 sec

total = 17 sec

Answer:

If 8 is the first term, and 1/64 is the tenth term, we can write the following equation to figure out the common ratio (r):

8r^9 = 1/64

r^9 = 1/512

r^9 = (1/2)^9 (rewrite 1/512. Since 512 = 2^9, 1/512 becomes (1/2)^9)

Solving this, r = 1/2 or 0.5 so the geometric sequence becomes:

8, 4, 2, 1, 1/2, 1/4, 1/8, 1/16, 1/32, 1/64 ...

Answer:

3S - 9 =4S( S -9 )

3S - 9 =4S -36

S = 27

The father is 3*27 = 81 years now.

The son is 27 years now.

Answer:

(a)11 hours

(b)19.5 hours

(c)2.5 hours

Step-by-step explanation:

The number of hours of​ daylight, H, on day t of any given year in a particular city can be modeled by the function :

[tex]H(t)=11+8.5\sin\left(\dfrac{2\pi}{365}(t-83)\right)[/tex]

(a)When t=83

[tex]H(83)=11+8.5\sin\left(\dfrac{2\pi}{365}(83-83)\right)\\=11+8.5\sin 0\\=11$ hours[/tex]

(b)When t=175

[tex]H(175)=11+8.5\sin\left(\dfrac{2\pi}{365}(175-83)\right)\\=11+8.5\sin\left(\dfrac{2\pi}{365}\times 92 \right)\\=11+8.5\\=19.5$ hours[/tex]

(b)When t=358

[tex]H(175)=11+8.5\sin\left(\dfrac{2\pi}{365}(358-83)\right)\\=11+8.5\sin\left(\dfrac{2\pi}{365}\times 275 \right)\\=11-8.5\\=2.5$ hours[/tex]

Answer:

Step-by-step explanation:

students in 7th  grade took a standardized math test that they also had taken in 5th grade. the collected data showed that in two years the median increased by three points, and the mean increased by around two and a half points. In terms of the context, that proves that there is overall improvement in the grades of students.but there is a small difference between mean increase and median increase. While median increased 3 points, mean increased only by 2.5 points.  This implies there exists unusually low level iq students who had unusually low score thus affecting mean to be low.special training should be given to those students.

Answer:

In general, the students increased their standardized math scores from 5th grade to 7th grade. The students might be more familiar with the exam and they have learned more in their math classes.

Step-by-step explanation:

that is the sapmle response on edg.

Answer:

c) 5.95

Standard error of the mean = 5.95

Step-by-step explanation:

Explanation:-

Given mean of the credit score for residents of South Dakota  (x⁻) = 700

Given standard deviation(S.D) ( σ) = 46.1

Random sample size 'n' = 60

Standard error of the mean

                                        [tex]S.E = \frac{S.D}{\sqrt{n} }[/tex]

                                        [tex]S.E = \frac{46.1}{\sqrt{60} }[/tex]

                                       S.E = 5.95

Conclusion:-

Standard error of the mean = 5.95

Answer:

2.87 = AC

Step-by-step explanation:

Since this is a right triangle we can use trig functions

sin theta = opp / hyp

sin 35 = AC /5

5 sin 35 = AC

2.867882182= AC

To the nearest hundredth

2.87 = AC