Problema Solution
z varies directly as x^2. If z=8 when x=2, findz when x=7
Answer provided by our tutors
z varies directly as x^2 means
z = k*x^2, where k is constant
when x = 2 we have z = 8 that is:
8 = k*2^2
k = 8/4
k = 2
z = 2x^2
for x = 7 we have
z = 2*7^2
z = 2*49
z = 98