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-2,
18. The number of terms in the expression
15x4 - 3x2 +7.
A 1
B. 2
C. 3
D. 4
19. These are numbers that have fixed
values.
A. Constants
B. Exponents
C. Terms
D. Variables​


Sagot :

Answer:

18.

15x4-3x7

evaluate

7+15x²-3x²

differentiate w.r.t. x_4

15

19. Variable

The numbers which have definite value is known as constant. The numbers which don't have a definite value is known as variables.