18. In the expression 42xy'. What do we call 3?
a) constant
b) exponent
c) term
d) variable

15. Gordon's height is 4 feet and 5 inches. What is his height in inches? (1 ft. = 12 in.)

a) 45 inches
b) 4.5 inches
c) 53 inches
d)5.6 inches​