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3 years ago

Can someone please clearly explain Question 7 and how to work this out?

Mathematics

1 answer:

SVETLANKA909090 [29]3 years ago

7 0

Make x the subject means you need to solve for x

y = ax^2 solve for x

divide both side by a

y/a = ax^2/a

simplify
y/a = x^2
so
x = square root (y/a)

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Explain how to isolate the variable in this equation -2/5x+7=15

SSSSS [86.1K]

Answer:

$x = -20$

Step-by-step explanation:

Use inverse operations and simplification to isolate the variable in the equation.

$-\frac{2}{5}x + 7 = 15\\-7\\\\-\frac{2}{5}x = 8\\$

Now divide the equation by $(-\frac{2}{5})$ remember, dividing a fraction is the same as multiplying by the reciprocal. The reciprocal of a fraction is when one switches the places of the numerator (number on top of a fraction bar), and the denominator (number on the bottom of the fraction bar).

$-\frac{2}{5}x = 8\\$

÷ $-\frac{2}{5}$

$x = 8 * (-\frac{5}{2})$

Simplify,

$x = 4 *(- 5)\\\\ x= -20$

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3 years ago

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Answer:

Step-by-step explanation:

Good evening ,

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3 years ago

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RoseWind [281]

Answer:

Step-by-step explanation:

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gregori [183]

V=hpir^2

A.
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B.
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Step-by-step explanation:

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