Find x if the average of 20,20,19,13 and x is 16

Three people toss a fair coin and the odd one pays for coffee. if the coins all turn up the same, they are tossed again. find the probability that fewer than 4 tosses are needed.

If a = 3, b = 1, and c = - 1, what does (b + c) - (c-a) - equal?

Match the situation to the correct expression. the product of 40 and n Select the correct answer. a) n + 40 b) 40n c) 40/n d) n - 40

What is the answer to 4a+10b+12d. what is b

Nora traveled from Kansas City to Louisville, a distance of 520 mi, in 10 hr. Find her rate in miles per hour

How do you write 304,800,400 in expanded form and standard

If George has 507 marshmallows and Hannah has 3 times as much, how much does Hannah have?

How do you tell whether the ratios form a proportion

Which number is an irrational number

Show your work. - 3 (x+2) + 5x=-9. solve and check.