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ExtremeBDS [4]
2 years ago
6

ASAP I WILL( GIVE 24 POINTS)

Mathematics
1 answer:
Sloan [31]2 years ago
7 0

Answer:

a. steve

b. temperature

c. table

d. tony

Step-by-step explanation:

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Solve the following equations express your answers as order pair in format a,b 2x+7y=-1 and 4x-3y=-19
Ksivusya [100]

Answer:

(x , y) = ( -4 , 1)

Step-by-step explanation:

2x + 7y = -1 --------eqn 1

4x - 3y = -19 ----------eqn 2

Step 1: let's pick eqn 1, to make y the subject of the formula

2x + 7y = -1

7y = -1 - 2x

Divide both sides by 7, to make y the subject of the formula

7y/7 = (-1 - 2x)/7

y = (-1 - 2x) / 7

Step 2: substitute y into the equation 2

4x - 3y = -19

4x - 3(-1 - 2x)/7 = -19

Open the bracket

-3 * -1 = +3

-3 * -2x = +6x

4x +( 3 + 6x)/7 = -19

LCM = 7

(28x + 3 + 6x)/7 = -19

(34x + 3)/7 = -19

Cross multiply

34x + 3 = 7 * -19

34x + 3 = -133

34x = -133 - 3

34x = -136

Divide both sides by 34,to get the value of x

34x/34 = -136/34

x = -4

Step 3: substitute x = -4 into eqn 1

2x + 7y = -1

2(-4) + 7y = -1

-8 + 7y = -1

7y = -1 + 8

7y = 7

Divide both sides by 7, to the value of y

7y/7 = 7/7

y = 1

(x , y) = ( -4 , 1)

3 0
3 years ago
Plz answer asap thanks
Nady [450]
So basically you know that 25 x 17 is 425. So all you would do is estimate! It's super simple. Just do 25 x 17, then put your estimate in the estimate box. 5 or higher it goes up, 4 or lower it goes down, so for your estimate I would probably put 430. Hope this helps! :)
7 0
3 years ago
Read 2 more answers
If a person walks 1/3 a mile in each 1/2 hour, how far does he walk in 1 hour.
serg [7]

Distance travelled in 30 minutes = 1/3 miles

Distance travelled in 1 minute = 1/(3 × 30)

Distance travelled in 60 minutes = (1 × 60)/(3 × 30)

= 2/3 miles

5 0
3 years ago
Select all the true statements. Triangle A B C where the measure of angle A is 2 x plus 1 degree, angle B is x degrees, and angl
Step2247 [10]

Answer:

B= 41; C  = 56; A = 83

Step-by-step explanation:

Given

A = 2x + 1

B = x

C = x + 15

Required

Arrange the angles from smallest to largest

First, we need to determine the value of x.

Since, it is a triangle:

A + B + C = 180

Substitute values for A, B and C

2x + 1+ x + x + 15 = 180

Collect Like Terms

2x + x + x = 180 - 15 -1

4x = 164

Solve for x

x= 164/4

x= 41

Solve for A, B and C

A = 2x + 1

A = 2 * 41 + 1

A = 82 + 1

A = 83

B = x

B= 41

C = x + 15

C  = 41 + 15

C  = 56

From Smallest to Largest, we have:

B= 41; C  = 56; A = 83

6 0
3 years ago
A designer is making a rectangular prism box with maximum volume, with the sum of its length, width, and height 8 in. The length
Sever21 [200]

Answer:

width = 1.8 in

length =   3.6 in

height =8-3w =8-3(1.8)= 2.6 in

Step-by-step explanation:

A designer is making a rectangular prism box with maximum volume, with the sum of its length, width, and height 8 in

Let l , w and h are the length , width and height

l +w+h=8\\l=2w

Plug it in the first equation

2w+w+h=8\\3w+h=8\\h=8-3w

volume the box is length times width times height

volume = (2w)(w)(8-3w)\\16w^2-6w^3

To get maximum volume we take derivatived

v'=32w-18w^2

set the derivative =0 and solve for w

0=32w-18w^2\\0=-2w(9w-16)\\w=0 , w= \frac{16}{9}

width = 1.8 in

length = 2w= 3.6 in

height =8-3w =8-3(1.8)= 2.6 in

6 0
4 years ago
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