Ms. Cathy bought a package of pens. Out of every 10pens , 9 are black. If there are 70 pens in the pack, what fraction of the pens in the pack are black? What percent of the pens in the pack are black.

If a and b are integers and a + b = 0, what do you know about the values of a and b?

Solve the inequality 3 + |t + 4| < 10

Assume that x is a random variable in a probability distribution with mean μ and standard deviation σ. find expressions for the mean and standard deviation if every value of x is modified by first being multiplied by 4, then increased by 5.

Find the Factors of 84.

Simplify. -12x+3-4x+5+3/2x

Raquel has 18 eggs. she uses half of them in a omelet for some cookies. then she uses half of what's left afther she makes cookies for a casserole for dinner. how many eggs are left at the end of the day

Angle's father rides a motorcycle every weekend. He rides to relax. He travels 78 miles in two days every weekend. if he travels the same amount of miles on both days, how many miles does he travel in one day?

201 is 67% of what amount?

Jameel is 8 inches taller than his sister. His sister is 41 inches tall. Write an equation that can be used to find his height

150 grams of fertilizer is required for a land area of six square meters, at this rate how many grams of fertilizer are required for a land area of 13 square meters