Answer:
1/6
Step-by-step explanation:
20 sec of 120 sec = 20/120 = 1/6
Answer: 
Step-by-step explanation:
All that is required here is to substitute x = 2x into the right side in the same way that is done for a numeric value.

Answer:
f(-3) = 4(-3) + 5 = -12 + 5 = -7. the answer is #2.
Answer: −
0.875
Because you just turn -0.875 into a decimal: To convert a fraction to a decimal, divide the numerator by the denominator. If required, you can use a calculator to do this.