L varies directly with the square of Z. L is 12 when Z is 2. Find the value of L when Z is 4.

L = 48

Step-by-step explanation:

Given that L varies directly with Z² , then the equation relating them is

L = kZ² ← k is the constant of variation

To find k use the condition L = 12 when Z = 2 , then

12 = k × 2² = 4k ( divide both sides by 4 )

3 = k

L = 3Z² ← equation of variation

When Z = 4 , then

L = 3 × 4² = 3 × 16 = 48

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x=-7

step-by-step explanation:

x+3=-10

-10+3=-7

x=-7