The variable z is directly proportional to x. When x is 10, z has the value 140.

What is the value of z when x = 20?

z = 280

Step-by-step explanation:

If two variables are directly proportional, it means that an increase in the value of one variable causes an increase in the value of the other variable. Also, a decrease in the value of one variable causes an decrease in the value of the other variable.

The variable z is directly proportional to x. If we introduce a constant of variation, the expression would be

z = kx

When x is 10, z has the value 140. It means that

140 = 10k

k = 140/10

k = 14

The equation becomes

z = 14x

the value of z when x = 20 is

z = 14 × 20

z = 280

step-by-step explanation:

hans did not square the 40-unit side; he merely multiplied it by 2.   incorrect.

47 - 90 = 43

43 - 180 = x

x = 137