Alex puts $2000 in a saving account. after 4 years, she had $2543 in the account. what rate of interest did she earn? use the formula a=pe^rt, where a is the ending amount, p is the principal (initial amount), r is the interest rate, and t is time. a. 24% b. 12% c. 6% d. 8%

The number of potato chips in a bag is normally distributed with a mean of 71 and a standard deviation of 2. approximately what percent of bags contain between 69 and 73 potato chips? approximately 68% approximately 71% approximately 95% approximately 99.7%

Expresa commuter train leaves downtown sation and travels at a average speed of 55 miles per hour towards the north side sation, which is 50miles away. thirty minutes later, express commuter train #7 leaves north side and travels at a average speed of 35miles per hour towards downtown sation. at the moment the two trains pass each other, how far(in miles) is train #12 from the downtown sation and how long(in minutes) has the #12 train been traveling

Which of the following is the result of expanding the series