# math

posted by Tammy

4. ### math

David has just received his income tax refund of $1438.11, and he needs$1742 to buy a new television. If his money can earn % simple interest , how long must he invest his tax refund?
5. ### Physics

Sam, whose mass is 72.0 kg, takes off down a 51.0 m high, 11.0^\circ slope on his jet-powered skis. The skis have a thrust of 180 N. Sam's speed at the bottom is 43.0 {\rm m/s}. What is the coefficient of kinetic friction of his skis …
6. ### physics

Secret agent Samantha Bond, 43.00 kg, has just ignited her jet powered skis at the foot of a 10.0 degree slope that rises in height by 50.0 m. The skis have a thrust of 226.0 N. When she gets to the top of the slope, she keeps the …

9. ### statistics

Suppose that the amount of time it takes the IRS to refund to taxpayers is normally distributed with a mean of 12 weeks and a variance of 9. a. What percent of taxpayers should get a refund within 5 weeks?
10. ### Math-Probability

In 2008, 1.01% of returns were audited, 85.6% returns received a refund, 49,907 the number examined resulting in a refund, 1,342,674 number examined resulting in no refund. If a taxpayer receives a refund, what is the likelihood that …

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