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Sphinxa [80]
3 years ago
13

HELP PLZ!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

Mathematics
2 answers:
Maurinko [17]3 years ago
5 0

Answer:

D. x=-5,y=\frac{5}{4}

Step-by-step explanation:

\begin{bmatrix}5x+4y=-20\\ 5x+12y=-10\end{bmatrix}

Subtract Equation 2 - Equation 1:

5x+12y=-10\\-\\\underline{5x+4y=-20}\\8y=10

Divide both sides by 8:

\frac{8y}{8}=\frac{10}{8}

y=\frac{5}{4}

Substitute y=\frac{5}{4} into Equation 1:

5x+4y=-20

5x+4\times \frac{5}{4}=-20

5x+5=-20

Subtract 5 from both sides:

5x+5-5=-20-5

5x=-25

Divide both sides by 5:

\frac{5x}{5}=\frac{-25}{5}

x=-5

Bas_tet [7]3 years ago
4 0

Answer:

c

Step-by-step explanation:

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The answer is 1,088

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2 years ago
If a car has tires with a diameter of 28 inches and is traveling at 55 mph, how fast are its tires spinning, in rpm^ prime s (re
Aleksandr-060686 [28]

Answer:

The tires are spinning at 660.49 revolutions per minute.

Step-by-step explanation:

The speed of the tires (v) is the same that the speed of the car, so to find the angular velocity of the tires we need to use the equation:

\omega = \frac{v}{r}

Where:

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\omega = \frac{55 mph}{14 inches*\frac{1 mile}{63360 inches}} = 2.49 \cdot 10^{5} \frac{rad}{h}*\frac{1 h}{60 min}*\frac{1 rev}{2\pi rad} = 660.49 rpm              

Therefore, the tires are spinning at 660.49 revolutions per minute.

   

I hope it helps you!          

5 0
3 years ago
Write (27a^-3)^-2/3 in simpleset form
Luden [163]

Answer:

a²/9  

Step-by-step explanation:

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4 0
3 years ago
Read 2 more answers
I DONT KNOW WHAT IS 89090x908
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Step-by-step explanation:

hope dis helps!!!!

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Answer:

9

Step-by-step explanation:

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8 0
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