Given f(x)=-3x+21, find x when f(x)=6

x = 5

Step-by-step explanation:

f(x) = -3x + 21

It is required to find x when the value of f(x) = 6

Put f(x) = 6 in equation (1) such that we get :

6 = -3x+ 21

-6           -6

3x = 21 - 6

3x = 15

 3     3

x = 5

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.

a. 12.5 kg

step-by-step explanation:

f = ma

so

m = f/a = (2500 n)/(200 m/s²) = 12.5 kg

1 n = 1 kg·m/s²