Unit 2 Review Do Now Convert 1 320

Unit 2 Review Do Now: Convert 1, 320, 000 seconds to days (round to the nearest day) 1, 320, 000 sec About 15 days

Multiply both sides by 2: (2) Divide both sides by a: Take the square root of both sides: 2 d = at 2 a a (2)

3. ) Sam and Jeremy have ages that are consecutive odd integers. The product of their ages is 783. Which equation could be used to find Jeremy’s age, j, if he is the younger man? (1) j 2 + 2 = 783 (2) j 2 - 2 = 783 Let j = Jeremy’s age Let j + 2 = Sam’s age (3) j 2 + 2 j = 783 j(j + 2) = 783 (4) j 2 - 2 j = 783

Multiply by LCD to get rid of denominators: (28)(7 x) + (1)63 = 20(84) 196 x + 63 = 1680 196 x = 1617 x = 8. 25

Multiply both sides by 2: 2 A = h(b 1 + b 2) Divide both sides by h:

5 b) The area of a trapezoid is 60 square feet, its height is 6 ft, and one base is 12 ft. Find the number of feet in the other base. Use the formula we found in part a and plug in: b 1 =8 feet

6. ) When solving the equation 4(3 x 2 + 2) – 9 = 8 x 2 + 7, Emily wrote 4(3 x 2 + 2) = 8 x 2 + 16 as her first step. Which property justifies Emily’s first step? a. ) addition property of equality b. ) commutative property of addition c. ) multiplication property of equality d. ) distributive property of multiplication over addition

7. ) A cell phone company charges $60. 00 a month for up to 1 gigabyte of data. The cost of additional data is $0. 05 per megabyte. If d represents the number of additional megabytes used and c represents the total charges at the end of the month, which linear equation can be used to determine a user’s monthly bill? (1) c = 60 - 0. 05 d (2) c = 60 d - 0. 05 (3) c = 60. 05 d (4) c = 60 + 0. 05 d