Evaluate
when x = 5
103 Correct
Evaluate 2a  3 when a = 5
13 Correct
Evaluate 2a + 6b when a = 6 and b = 3
30 Correct
Not sure if it should be
12a + 18b tho
No, you're right the first time.
Evaluate
when x = 3

9 Incorrect. Should be 1
Evaluate c  3d when c  1 and d = 1/3
Don't understand this one. What does c equal? 0.1
Or should it be
c  0.9d?
x + x^3  4 x^4 when x = 2
54 Correct
Not sure if this should be
54x No
5a + 3a^2 when a = 3
12 or
12a?Answer is 12 Find F when c = 15 in the formula F = 9C/5 + 32
F = 86 Incorrect. Should be 59
I'm not sure if I should leave the variables in or not.