Y is directly proportional to x 2 . If y = 8 when x = 2 find y when x = 5

y=20 when x=5

Step-by-step explanation:

you can find the value of y when x is 1

(it'll be 4)

then you can multiply 4 by 5 which is 20

y = 50

Step-by-step explanation:

Given y is directly proportional to x² then the equation relating them is

y = kx² ← k is the constant of proportion

To find k use the condition y = 8 when x = 2 , then

8 = k × 2² = 4k ( divide both sides by 4 (

2 = k

y = 2x² ← equation of proportion

When x = 5 , then

y = 2 × 5² = 2 × 25 = 50

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.