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2 years ago

8

SUBSTITUTION METHOD-- help ?!

1 answer:

Oksi-84 [34.3K]2 years ago

5 0

If you want the x-coordinate of the solution of the system of lineare equations

<span>y - x = 9
10 + 2x = -2y

then you must eliminate y from this sytem. Rewrite the first equation: y - x = 9 becomes y = x + 9. Substitute this (x + 9) for y in </span><span>10 + 2x = -2y. y will now be gone. Solve the resulting equation for x and you'll be done.</span>

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Quick calculus question work doesn't have to be shown

Vinil7 [7]

$\bf \textit{volume of a sphere}\\\\
V=\cfrac{4\pi r^3}{3}\implies V=\cfrac{4\pi }{3}r^3
\\\\\\
\cfrac{dV}{dt}=\cfrac{4\pi }{3}\cdot \stackrel{chain~rule}{3r^2\cdot \cfrac{dr}{dt}}\quad 
\begin{cases}
\frac{dr}{dt}=50\\
r=6
\end{cases}\implies \cfrac{dV}{dt}=\cfrac{4\pi }{3}\cdot 3(6)^2\cdot 50\\\\\\ \cfrac{dV}{dt}=\stackrel{\frac{cm^3}{s}}{7200\pi}$

5 0

3 years ago

V<img src="https://tex.z-dn.net/?f=%5Cfrac%7B3%7D%7B4%7D%20%2A%202%5Cfrac%7B1%7D%7B3%7D" id="TexFormula1" title="\frac{3}{4} * 2

myrzilka [38]

Answer:

$1\frac{3}{4}$

Step-by-step explanation:

In order to find the answer, you first need to convert the mixed number (2 1/3) into a improper fraction and then multiply.

$\frac{3}{4} \times2\frac{1}{3}$

$2\frac{1}{3} =3\times2=6+1=7=\frac{7}{3}$

$\frac{3}{4} \times\frac{7}{3}$

$3\times7=21$

$4\times3=12$

$=\frac{21}{12} =\frac{7}{4} =1\frac{3}{4}$

$=1\frac{3}{4}$

Hope this helps.

7 0

2 years ago

At noon, a tank contained 5 cm of water. After several hours, it contained 4 cm of water. What is the percent decrease of water

dolphi86 [110]

Answer:

2cm I think sorry If its wrong

6 0

2 years ago

20 feet minus 10 inches= ? inches

Ann [662]

I think it's 230 inches
Cheers :3

3 0

3 years ago

Read 2 more answers

SOMEONE HELP ME!! NO ONE WILL HELP T^T WILL MARK BRAINLIEST

Anastasy [175]

Answer: nope!

Step-by-step explanation: there are 4 quarts in a gallon and we can see by adding the mango juice, there will be no space!

Water (2 quarts) mango juice (2 quarts) equals a gallon

Ginger ale = one gallon

That’s already 2 gallons and we still have the 2 pints of pineapple juice!

7 0

2 years ago