What equals to 20 and 84

Explain why this is or is not a probability distribution. x 1 2 3 4 P (x) 0.2 0.1 0.4 0.2

U decreased by the difference of t and 10

Evaluate the expression when y = 4. 5 + y + 8 13 17 21 72

On a book shelf there are 4 (different) math books and 6 (different) cs books. In how many ways can the books be arranged so that the math books are next to each other and the cs books are next to each other?

A bag contains 6 red marbles, 2 white marbles, and 1 gray marble. you randomly pick out a marble, record its color, and put it back in the bag. you repeat this process 45 times. how many white or gray marbles do you expect to get

0.88 kilogram what is the value of the digit in the tents place

S = 6ab + 4a^3 Make b the subject of the formula

X^2+10x+5=30 quadratic equation

There were 154 birds on the endangered species list in some year. this is 12 more than twice the number of reptiles on the list. How many reptiles were on the endangered species list in this year?

A clothing store sold three times as many shirts as pants. The difference in the sales was 800. How many of each were sold?