answer below
a. How many times must you multiply 8 times itself in the expression 84?
b. What is the value of 86?
a. 4
b. 262,144
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Solve the problem.The life span of a certain type of car timing belt, calculated in miles, is normally distributed, with a mean of 90,000 miles and a standard deviation of 8000 miles. If the maker of the timing belt wants less than 4% of the belts to fail while under warranty, for how many miles should the timing belts be guaranteed?
A. Less than 68,800 miles B. Less than 103,200 miles C. Less than 111,200 miles D. Less than 76,000 miles
Solve the right triangle shown in the figure. Round lengths to one decimal place and express angles to the nearest tenth of a degree. 
B = 30.4°, c = 3.4 mm
A. a = 2.9 mm, A = 59.6°, b = 2.1 mm B. a = 2.1 mm, A = 59.6°, b = 2.7 mm C. a = 2.9 mm, A = 59.6°, b = 1.7 mm D. a = 1.7 mm, A = 59.6°, b = 2.9 mm
Make the indicated conversion within units of time.Dane is planning on taking 9 weeks vacation this year. How many days of vacation is Dane taking?
A. 63 days B. 18 days C. 45 days D. 54 days
Solve the problem.The size of the bear population at a national park increases at the rate of 
per year. If the size of the current population is 127, find how many bears there should be in 7 years. Use 
and round to the nearest whole number.
A. 171 B. 175 C. 173 D. 177