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3 years ago

Pleaaseeee help me :/

Mathematics

1 answer:

Sav [38]3 years ago

8 0

Hello,

$\sqrt{x} - \sqrt{y} = (\sqrt[4]{x}+ \sqrt[4]{y} )( \sqrt[4]{x} - \sqrt[4]{y} )=72\\\\
\sqrt[4]{x}- \sqrt[4]{y}=6\\\\
(\sqrt[4]{x}+ \sqrt[4]{y})*6=72\\\\
\sqrt[4]{x}+ \sqrt[4]{y}=12 \\ 
\sqrt[4]{x}- \sqrt[4]{y}=6 \\\\
2 \sqrt[4]{x}=18==\textgreater\sqrt[4]{x}=9==\textgreater\ x=6561\\
2 \sqrt[4]{y}=6==\textgreater\sqrt[4]{y}=3==\textgreater\ y=81\\


$
Proof:
$\sqrt[4]{6561} - \sqrt[4]{81} =9-3=6\\\\
 \sqrt{6561} - \sqrt{81} =81-9=72$

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4 years ago

Richard is seven years older than Lilia. In ten years, the sum of their ages will be 51. How old is Richard now?

Vladimir79 [104]

Answer

Step-by-step explanation:

For this example, R = Richard and L = Lilia. You'll need to set up a system of equations with the information that the problem gives you.

R = L + 7

(R+10) + (L+10) = 51

Use the substitution method so that you only have one variable in the equation. The first equation tells you that R is the same as L+7, so put L+7 instead of R everywhere you see R in the second equation.

[(L+7) + 10) + (L+10) = 51

L + 7 + 10 + L + 10 = 51

Combine like terms.

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Isolate the variable by subtracting first, then dividing.

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2L = 24

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L = 12

You just solved for L (Lilia's age). Don't forget that you're trying to find R (Richard's age), so plug your L number into the first equation.

R = L + 7

R = 12 + 7

R = 19

Check your answer by plugging your solutions (R and L) into the second equation and see if it's true.

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4 years ago

A street light is mounted at the top of a 15-ft-tall pole. A man 6 ft tall walks away from the pole with a speed of 4 ft/s along

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As given the diagram (attached),

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I assume that the man and the pole are upright, meaning the 2 triangles are identical.

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15 (y-x) = 6y

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As we need to find rate of change (How fast), differentiate both sides with respect to time t. we get

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so dx/dt = 4, So, we need to find dy/dt (How fast the tip of shadow moving)

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Answer:

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Step-by-step explanation:

~~~~~~~~~~~~~~

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Answer:

Step-by-step explanation:

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3 years ago

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