Find the quantity indicated.
-f varies jointly as and h, and f = -81 when q = 3 and h = 3. Find f when q = 2 and h = 6.
A) f = -36
B) f = -12
C) f = -72
D) f = -18

Question

Find the quantity indicated.
-f varies jointly as  and h, and f = -81 when q = 3 and h = 3. Find f when q = 2 and h = 6.
A) f = -36 
B) f = -12 
C) f = -72 
D) f = -18

Quizplus · Accepted Answer

Start with the equation:
f = k(11ebb63d_1b64_c0a1_b851_f162f9c10b0d_TB8475_11)(h)

Plug in the given values for f, q, and h:
-81 = k(11ebb63d_1b64_c0a1_b851_f162f9c10b0d_TB8475_11)(3)
k = -9

Now use the value of k to find f when q = 2 and h = 6:
f = (-9)(11ebb63d_1b64_c0a1_b851_f162f9c10b0d_TB8475_11)(6)(2^-1)
f = -72

Therefore, the answer is C.

Find the Quantity Indicated