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**Skoz** 1. Solve.

a. 2^x+1=4

2. Simplify. Write each expression using only positive integers.

a. (27x^3y^9)^1/3 b. 3^2/9 x 9^1/3

7. According to the manual, the battery in a cellular phone loses 2% of its charge each day. Assume the battery is 100% charged.

a) Write an equation to represent the percent change, P, as a function of the number of days, x, since the battery was charged.

b) Determine the number of days until the battery is only 50% charged

12. Basket Robin buys its ice cream in cylindrical containers. These containers are approximately 90cm high with a diameter of 36cm. Each scoop has a diameter of 7cm. If each scoop sells for 1.45, how much money is made from ONE container?

18. A skyscraper aways 55cm back and forth from the vertical during high winds. At t=5s, the building is 55cm to the right of the vertical. The building sways back to the vertical and at t=35 s, the building sways 55 cm to the left of the vertical. Write an equation that models the motion of the building in terms of time.