Chapter 1-3 Exponents

Evaluate 7 to the zero power

1

Evaluate the expression 12x - 3y for x=4 and y=3.

12 x 4 = 48 - 9 = 39 3x3=9

Evauate the expression 7x- y x=3 y=2

19

Write 5 to the third power in standard form

5 x 5 x 5 = 125

Now find the value 7(12+4) - 5

97

Dan wrote 4 letters to friends each w week in a row. Write an expression to show the total number of letters Dan wrote. a) 4/w b) 4w c) 4+w d) 4-w

B)

Which of the following is equivalent to 2(n+3) a 6n b 2n + 5 c 2n + 6 d 2n + 23

C 2n + 6

Erin's house is 4.5 times larger than her old house. Let o represent the size of her old house. Which expression represents the size of her new house? a) 4.5o b)0 - 4.5 c)o + 4.5 d) o/4.5

a) 4.5o

What does the expression tell you to do: 7 (a + 5) a multiply some number by 7, thenj add five b multiply 7 and 5 by some number c add 5 to some number, then multiply by 7 d add 7 times 5 to some number

b multiply 7 by some number

Last week Tom worked 30 hours in the five days. Which equation could Tom use to find the average number of hours he worked each day? a) h/5=30 b)5h=30 c)h/30=5 d)30h=5

b)5h=30

Solve the equation 12t = 240. Check your answer. a t=120 b t=110 c t = 20 d t = 21

c t = 20

Position 1 2 3 4 m Value of Term 2 5 8 11 ? a) 2m b) 3m-1 c) 3m +1 d) 2m +1

c) 3m + 1

Toby has been asked to find the value of 7(12+4) - 5. What should he do first? a) subtract 5 from 7. b) multiply 7 and 12. c) Add 12 and 4 d) multiply 7 and 4

c) Add 12 and 4

Sara made a model airplane that was 21 feet shorter in length than an actual airplane. Let m represent the length of Sarah's model. Which expression represents the length of the actual airplane? a) 21 - m b) 21m c) m + 21 d) m-21

c) m + 21

If m equals the amount of money Trevor had in his ank account to begin with, which expression showes how much money was left after he took out $35? a 35m b 35 - m c m+ 35 d m - 35

d m-35

Write a numerical exxpression that shows "five times six is increased by seven

d) 5 x 6 + 7