4xy - 7y + 9xy + 12y I don't know how to do this and I'm getting bad grades because of this how to combine like terms

A box contains ten cards labeled J, K, L, M, N, O, P, Q, R, and S. One card will be randomly chosen. What is the probability of choosing a letter from L to Q?

16-z=12 solve equation

David is comparing the fractions 2/3 and 3/5. which shows yhe fractions correctly rewritten and compared with the same numerator?

There is a drought in the oak tree population is decreasing at a rate of 7% per year if population continues to decrease at the same rate how long will it take for the population to be half of what it is

In how many ways can the letters in the word balloon be arranged? 210 1,260 2,520 5,040

What number is 62.5% of 195?

2/w=0.4/0.7 what is w?

2.6 as an improper fraction

The length of a rectangle is 7cm less than twice it's width. If the area is 30 sq. cm, find the dimensions

Heights of 10 year-olds, regardless of gender, closely follow a normal distribution with mean 55 inches and standard deviation 6 inches. Which of the following is true? Roughly 95% of 10 year-olds are between 37 and 73 inches tall.