A letter that represents a number

Suppose two trains leave a station at the same? time, traveling in opposite directions. Train B travels 20 mph faster than Train A. In 3.5? hours, the trains are 378 miles apart. Find the speed of each train

Round the number below to the thousands place 2,181,465

Let A = {10, 20, 30, 40, 50, 60} and B = {10, 40, 60}. What is A ∩ B?

20% of income is saved of $24 hr. How much money is saved in a given number of hrs. Write an expression?

You ask a neighbor to water a sickly plant while you are on vacation. Without water the plant will die with probability 0.7. With water it will die with probability 0.6. You are 86 % certain the neighbor will remember to water the plant.

Use synthetic division to check - 4 is a root of the polynomial expression: x^4+2x^3-9x^2-2x+8=f (x)

How do you know that the answer to a decimal subtraction problem is reasonable

In a college parking lot, the number of ordinary cars is larger than the number of sport utility vehicles by 59.3%. The difference between the number of cars and the number of SUVs is 16. Find the number of SUVs in the lot.

F = 1/2 (r + 6.5) Show Work!

A guitar is on sale for 20% off the original price. Let p represent the original price. What expression can be used to calculate the sale price?