The mean score of a placement exam for entrance into a math class is 80, with a standard deviation of 10. Use the empirical rule to find the percentage of scores that lie between 60 and 80. (Assume the data set has a bell-shaped distribution.)

If f (x) = 7x, which of the following is the inverse of f (x) ?

Which is the graph of the y=2sec (x-pi/3) ? The answer is graph C for Edge.

Ruby uses 1/4 yard of ribbon to make 2 bows. If r is the amount of ribbon she uses for bows, in yards, which division equation describes the situation?

The smiths spend 8% of their budget on entertainment. Their total budget this year is $2000 more than last year and this year they plan to spend $3840 on entertainment. What was their total budget last year?

Integers and the decimal equivalent of fractions are?

Evaluate the expression. 4 5 + 3 5 - 2 5 : 1 3 Write your answer as a fraction or as a whole or mixed number.

Negative two minus seventeen plus twelve minus negative four

What is 925 divided by 37

150 of 300 students at smith middle school are in band. of those only 10% play saxophone. next year enrollment is expected to reach 400 students. About how many of those students will play saxophone?

Sharon uses 72 centimeters of ribbon to wrap gifts. she uses 24 centimeters of her total ribbon to wrap a big gift she use the remaining ribbon for 6 small gifts how much ribbon will she use for each small gift if she use the same amount on each