The cube of y varies directly as z. When y = 8, z = 8. Heather’s work finding the value of y when z = 64 is shown: y^3 = kz
8 = k x 8
1 = k

y^3 = 1 x 64
y^3 = 64
y = 4

What is the first error, if any, in Heather’s work?

A. She did not make any errors.
B. She substituted incorrectly when calculating the constant of variation.
C. She cubed the wrong variable when making her equation.
D. She used an equation that models inverse variation instead of direct variation.

step-by-step explanation:

6.48/4 4 goes into 6.48 1.62 times

54 kilometers per hour

step-by-step explanation:

according to rules:

1 km = 1000 meter

which means that 1 meter = 1/1000 km

1 hour = 3600 second [ as 1 hour = 60 min = 60 *60 seconds ]

which means that 1 second = 1/3600 hour

therefore, 1 kilometer/hour =

thus to convert 15 meter per second to kilometer per hour, we multiply 15 to 3.6 kilometer/hour.

15 meter/second=   which is the required answer.

$5.41

step-by-step explanation:

$20 - $14.51 = $5.49.