a cog company produces 20 cogs a day, 4 of which are defective. Find the probability of selecting 4 cogs from the 20 produced where all are defective?

A farmer grows only corn and lettuce. the farmer plans to plant 455 rows this year. the number of rows of corn will be 2.5 times the number of rows of lettuce. how many rows of each vegetable does the farmer plan to plant?

What is the product (-2x-9y^2) (4-x-3)

A sum of £40 is shared between several people so each receives 2/7 of a pound. how many people receive a share?

Based upon relative frequency, it has been determined that 15% of all cars tested emit excessive hydrocarbons, 12% emit excessive CO, and 8% emit excessive amounts of both.

Brian needs to buy some pencils. Brand A has a pack 12 of pencils fo r2.98. Brand B has a pack of 18 pencils for 4.99.

What expression is equivalent to - 5 (3x - 4)

Solve by substitution or elimination 2x + y = 5 2x - y = 3

3. Subtract: 4x^3-6x^3+8x-9 from 7x^3-16x+18

What is 17 and five divided by 8

One rate of an equivalent ratio is 9/n. Select two other rates, one that can be solved by using equivalent fractions and the other by unit rates 0