A certain two-digit number, n, has a units digit that is three times the tens digit
. Which of the following must be true
A. n>20
B. n<40
C. n is odd
D. n is even

Math it's appreciated. (picture provided)

If the car had not hit the fence, how much farther would it have skidded? solve the skid-distance formula to find the extra distance that the car would have traveled if it had not hit the fence. round your answer to two decimal places. note that unit conversion is built into the skid distance formula, so no unit conversions are needed.

2f(x)= x+3 if 4 < x < 8 2x if x 28 2