21 students in each of 3 classes are going to the zoo. How many buses will be needed if each bus carries 11 students?

9x square 5x + square 5x

85% of what number is 306?

Each day Steven walked 1/12 mile more than the previous day. The first day he walked 1/12, the second day he walked 2/12 mile, the third day he walked 3/12 mile. On which day did the sum of his walks total at least 1complete mile?

When jill started jogging, she ran 3/4 mile on the first day, 1 1/8 miles on the second day, and 1 1/2 miles on the third day.

Decompose the fractions 3/5 & 7/10

The table shows data for a car stopping on a wet road. v d 20 38 30 86 40 153 stopping distance formula d (v) = 2.15v2/64.4f Determine the value of f, rounded to the nearest hundredth.

Write an expression for the sum of d and 9

What is a 4:1 ratio? Is it equivalent to 75% to 25%?

Given the net with dimensions below, find the surface area of the shape. 6 ст 3 cm 4 cm

Given the the sequence 3 + 8 + 13. obtain the common difference