If the mean of normally distributed test scores is 78 and the standard deviation is 7 find the percentage of scores in the following ranges:

a) 71-92

b) 64-100

c) 70-80

Debbie cut a cord into sixths. She used five of the pieces to make necklaces. She used equal lengths of the remaining cord for each of four bracelets. What fraction on the original cord did Debbie use for each bracelet?

What is 1 decreased by 1/10

The number y of deer in a county after x years can be modeled by y=0.75x^2 + 10.5x + 1300. When were there about 2000 deer? Round your answer to the nearest whole number.

Asment Given the related graph for each equation, determine the graph that represents a quadratic equation that has one real solution. 0 = 2 (x - 2) 2 + 3 0 = 2 (x - 2) 2- 2 0 =-2x2 + 2 0 = 2 (x - 1) 2 ty

Z2=49 what are the solution?

How do you graph (y=-1/2x-1) (y=-3x+4)

A motorboat travels 448 kilometers in 8 hours going upstream and 516 kilometers in 6 hours going downstream. What is the rate of the boat in still water and what is the rate of the current?

Jack made 50% more smoothies than yesterday. If he made 30 smoothie today how many did he make yesterday?

Mr. Ramirez has enough money to fence one of his rose gardens, how many feet of fencing will he need if both gardens have the same perimeter

David saves $175 each month for the first 5 months. Then he saves $225 each month for the next 5 months. What is the average amount that David saves each month