Solve for elimination x-4y= -9 and -x+3y=7

Answer:

x=23.5

Step-by-step explanation:

90=25-x/2+18

combine like terms

90=43-x/2

subtract 43 from both sides

47= -×/2

47/2= 23.5

x=23.5

or

90-25= 65

65-18=47

47/2=23.5

Answer:A

Step-by-step explanation:

Answer:

4x-27x-54-90=

Step-by-step explanation:

well first you have to subtract x which is -23x              

then u have to bring 90+54 on the other side

which then leaves you with

-23x=144

x=-6.260869565217391

can i also get brainliest please

Answer: it should be d pretty sure

Step-by-step explanation:

Answer: 56mm

Step-by-step explanation:

A=(a+b)/2 x h

A=(4+12)/2 x 7

A=16/2 x 7

A=8 x 7

A= 56mm

Answer:

[tex]y = -3x +8[/tex]

Step-by-step explanation:

The graph diagram is not given; however, the equation can be solved from the given points

(2,2) and (0,8)

This is represented as:

[tex](x_1,y_1) = (2,2)[/tex]

[tex](x_2,y_2) = (0,8)[/tex]

Calculate slope (m)

[tex]m = \frac{y_2 - y_1}{x_2 - x_1}[/tex]

[tex]m = \frac{8 - 2}{0 - 2}[/tex]

[tex]m = \frac{6}{- 2}[/tex]

[tex]m =-3[/tex]

The equation is calculated using:

[tex]y - y_1 = m(x - x_1)[/tex]

[tex]y - 2 = -3(x - 2)[/tex]

[tex]y - 2 = -3x + 6[/tex]

Add 2 to both sides

[tex]y - 2 +2= -3x + 6+2[/tex]

[tex]y = -3x + 6+2[/tex]

[tex]y = -3x +8[/tex]

Answer: To find the x-intercept, substitute in 0 for y and solve for x. To find the y-intercept, substitute in 0 for x and solve for y.

x-intercept(s):  (−3,0),(2,0)

y-intercept(s): (0,6)

Answer:

?? I don’t speak spanish

Step-by-step explanation:

Given :

cos x = 1.7/2 .

Also, x is an acute angle.

To Find :

The value of angle x.

Solution :

cos x = 1.7/2

Applying cos inverse both the sides, we get :

[tex]cos ^{-1} (cos\ x ) = cos^{-1} \dfrac{1.7}{2}\\\\x = cos^{-1} \dfrac{1.7}{2}[/tex]

Calculating the value of  [tex]cos ^{-1} \dfrac{1.7}{2}[/tex] from calculator, we get :

x = 31.79°

Therefore, the acute angle x is 31.79°.

Answer:

1.87500

Step-by-step explanation:

Answer:

2x+8

Step-by-step explanation:

let the number=x

Twice the number=2x

sum of 8 and twice the number=2x+8

Complete question is;

A group of biologists is surveying the mice population in a forest. The equation n=75⋅3t gives the total number of mice, n, t years since the survey began.

what does the number 3 mean in this situation.

1. the common difference

2. the total population

3. the common ratio

4. the slope

Answer:

3 is the common ratio

Step-by-step explanation:

We are given that the equation; n = 75⋅3^(t) gives the total number of mice, n, t years since the survey began.

Normally, formula when calculating population growth takes an exponential function;

n = n_o(e^(rt))

Or in this our case, it can be written as;

n = n_o((e^(r))^(t))

Comparing this with n = 75⋅3^(t), we can see that e^(r) = 3

Where r is the growth rate.

e is exponential constant.

Thus, we can say that 3 is the common ratio

Hey there! I'm happy to help!

The greatest common factor is the largest factor that both numbers contain. Let's look at the factors of these terms.

12x²: 1, 12, 2, 6, 3, 4, x, x

15x³: 1, 15, 3, 5, x, x ,x

We see that both of these numbers contain a 3 and 2 x's, so our GCF would be 3x².

Have a wonderful day!

Answer:

6/8

Step-by-step explanation:

double both of them lol

Answer:

3/4 is equivalent to 6/8 and 12/16

Step-by-step explanation:

Step-by-step explanation:

Since 6 Pazzo dog food cost $25.50,

5 Pazzo dog food would cost $25.50 * 5/6 = $21.25.

Hence Michael would spend $21.25.

Answer:

$21.25

Step-by-step explanation: $4.25 for each bag so $4.25 x 5= $21.25

Step-by-step explanation:

The equation of the line is y = -1.5x + 3.

Answer:

6  "surprise" flavors jellybeans

Step-by-step explanation:

From the information given:

The bag contained a mixture of regular flavored jellybeans and "surprise" jellybeans.

There are 40 jellybeans in the bag.

If 15% of the jellybean were "surprise" flavors.

Then, the number of expected "surprise" jellybeans will be:

= 15% of 40 jellybeans

= (15/100) × 40

= 6  "surprise" flavors jellybeans

If  6 surprise jellybean is contained in the bag;

Thus, the number of regular flavored jellybean will be

= 40 - 6

= 34 regular flavored jellybean

Answer:

See below

Step-by-step explanation:

a) The vertex is (0,2) so the standard form equation is (x-0)^2=4p(y-2). Since p=1/(4a) and a=1/8, then p=1/(4(1/8))=1/(1/2)=2. This makes the equation now x^2=8(y-2). Given the focus point for a vertical parabola is (h,k+p) then the focus point is (0,2+2) which is (0,4)

b) They are both 4 units away

c) I can't solve

d) I can't solve

Answer:

alr i tried, i hope i got them right! <3 pls let me know if i got them wrong.

1. 108 | 6x12 = 72 9x12 = 108 |

2. 91 | 13x7 = 19

3. 19 | 108/6 90/6 = 19/15 |

4. 50. 400/8 = 50

5. 50. 300/6

hope this helped! <3

Step-by-step explanation:

Answer:

m = n = 20

Step-by-step explanation:

Here, we want to find the missing side lengths

For a 45-45 triangle, the lengths have a side ratio of;

1:1: √2

We should understand that the triangle is isosceles ( opposite and adjacent are equal)

So n = m

So what we just need to do here is divide 20 √2 by √2

Mathematically, that would be;

20 √2/√2 = 20

Answer:

8p²q²r² - 7p²q²r² + q²r²

Step-by-step explanation:

Answer:

see below

Step-by-step explanation:

Cost for 5 pounds of apples:

  ($4.25 * 5 pounds) - $2 coupon

  21.25 - 2

  19.25

Cost of apples with p pounds:   4.25p

If one pound was purchase: 4.25p = 4.25(1) = 4.25

Answer:

Equation

1.95+1.6m ≤ 22

If solved

m ≤ 12.53

Step-by-step explanation:

SO we know the initial fee is 1.95

and for every mile driven, its $1.6

And we know that Shelly can spend less then or exactly the price of 22.

We know that m is miles driven

So we can make an equation

1.95+1.6m ≤ 22

1.95 can’t change since initial fee

1.6*m becuase its 1.6 for every mile driven and since “m” miles were driven, we multiply that by 1.6

Now it can’t go over 22 but it could be less than 22.

So this equation makes sense

If we solve it, it would be about  m ≤ 12.53 miles

Answer:

A: 428.75/ 24.5 = $17.50 per sq foot

B: 62.50*24.50 = $1,531.25

C: 428.75 + 1,531.25 + 137.50 = $2,097.50 for the total replacement

Step-by-step explanation:

Answer:

1.95

Step-by-step explanation:

4.55/7=65

65 cents for 1

65x3=1.95

Brainliest?

Answer:

Step-by-step explanation:

-2/6=-1/3

-1/3 is the slope.

formula is rise/run

Answer:

Slope= [tex]rise/run[/tex]

slope= - 1/5

Step-by-step explanation:

(3,2)  (-2,3)

formula = [tex]y2-y1/ x2- x1[/tex]

                  [tex]3-2 / -2 -3[/tex]

                        [tex]1/-5[/tex]

slope= - 1/5

Answer:

0.51

Step-by-step explanation:

Total free throws taken = 45

Number of successful free throws = 23

Average number of free throws made (x) :

Successful free throws / Numbe rod free throws taken

23 / 45 = 0.511

x = 0.51