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3 years ago

I need help with this math problem

Mathematics

2 answers:

slega [8]3 years ago

8 0

4 hours

Because 12 times by 3 is 36 so you times 1 hr and 20 mins by 3

1 hr 20+1 hr 20+ 1hr 20 = 4 hrs

Anika [276]3 years ago

5 0

She did 12 questions, and needs to do 36.

36 / 12 = 3, so it will take 3 times as long.

1 hour 20 minutes times 3 = 4 hours.

It will take her 4 hours.

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Inga [223]

Answer:

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Step-by-step explanation:

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3 years ago

What is the x-coordinate of the solution of the system? x+y+3 4x-y=-38

steposvetlana [31]

Note: I am assuming the first equation is:

x+y = 3

Answer:

The solution to the system of equations is:

(x, y) = (-2, 36)

Therefore, the x-coordinate of the solution of the system

x = -2

Step-by-step explanation:

Given the system of equations

$\begin{bmatrix}x+y=34\\ x-y=-38\end{bmatrix}$

subtracting the equations

$x-y=-38$

$-$

$\underline{x+y=34}$

$-2y=-72$

solve -2y for y

$-2y=-72$

Divide both sides by -2

$\frac{-2y}{-2}=\frac{-72}{-2}$

$y=36$

For x+y=34 plug in y = 36

$x+36=34$

Subtract 36 from both sides

$x+36-36=34-36$

Simplify

$x=-2$

Thus, the solution to the system of equations is:

(x, y) = (-2, 36)

Therefore, the x-coordinate of the solution of the system

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3 years ago

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babunello [35]

Answer:

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Step-by-step explanation:

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4 0

3 years ago

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