How to add exponents

Practice Questions

PSAT Math › How to add exponents

Page 1 of 2

10 of 15

1

If _a_2 = 35 and _b_2 = 52 then _a_4 + _b_6 = ?

2

If $3^{4x+6}=27^{2x}$ , what is the value of ?

3

If $9^{(x + 5)}+3^{2(x+5)}=162$ , what is the value of ?

4

How many of the following base ten numbers have a base five representation of exactly four digits?

(A)

(B)

(C)

(D)

5

Evaluate:

$-\left ( -3 \right )^{0}-\left ( -3^{0} \right )$

6

Solve for x.

23 + 2x+1 = 72

7

If $\dpi{100} \small r$ and $\dpi{100} \small s$ are positive integers, and $\dpi{100} \small 25\left ( 5^{r} \right )=5^{s-2}$ , then what is $\dpi{100} \small s$ in terms of $\dpi{100} \small r$ ?

8

What is the value of such that ?

9

Simplify:

$3\sqrt{18} + 2\sqrt{50}$

10

Which of the following is eqivalent to 5_b_ – 5(_b–_1) – 5(_b–_1) – 5(_b–_1) – 5(_b–_1) – 5(_b–_1) , where b is a constant?

Page 1 of 2

Return to subject