Which of the following must be proven before it can be stated as true?

1) definition

2) postulate

3) hypothesis

4) theorem

A man spent exactly $2.50 on 3-cent, 6-cent, and 10-cent stamps. if he bought ten 3-cent stamps and twice as many 6-cent stamps as 10-cent stamps, how many 10-cent stamps did he buy?

The quotient of 10 plus x and y minus 3?

Every 1/2 hour naomi stretches her neck; every 1/3 hour she stretches her legs; every 1/6 hour she stretches her arms. which parts of her body will naomi stretch when 2/3 of an hour has passed?

What is the square root of 74

I am less than 45, i am greater than 38 who am i?

I am 3 years younger that my brother, and I am two years older than my sister. My mom age is one less than 3 times my brother age. When you add all our ages, you get 87. What are our ages?

Between what two integers does - 6.2 lie?

Javier had $305 in his bank account. His bank charges a fee of $7.50 each month that a balance is below $500. If he makes no other deposits or withdrawals, how much money is in Javier's account at the end of three months?

If line XZ is 2ft, line YZ=18in. what is the length of line XY

Alexandra spent her birthday on a video game that cost $24, a controller for $13, and a memory card for $16. there total tax was $3. what is a subtraction equation for finding how much she gave alexandraif she received $4 in change