Answer:
$47.23
Step-by-step explanation:
This is some hard work ex18 I think. cool place egypt
Sure what can I help with?
Answer:
y = 1/9 x z^3
Step-by-step explanation:
y is jointly proportional to x and z^3
y = k * x * z^3 where k is the constant of proportionality
y =12, x = 4 and z =3
12 = k * 4 * 3^3
12 = k * 4 * 27
12 = k * 108
12/108 = k
1/9 = k
y = 1/9 x z^3
-20+13=-7 , -7 multiplied by -3 equals 21
