I need to understand proofs

Lisa went to the hardware store and bought 12 pieces rope. Each rope was 3 4 of a meter long. If the rope cost $3.50 a meter, how much did she spend?

Complete this sentence: the longest side of a triangle is always opposite of what?

9) Norachai rented a bike from Lisa's Bikes. It cost $17 plus $6 per hour. If Noracha paid $29 then he rented the bike for how many hours?

What is the domain and range of y=x^2-14x+44

How is each function related to y=x? Graph the function by translating the parent function. y=x-3

Which graph represents the compound inequality? n=4

How many times does a dragonfly's wing beat per minute

How to solve 2x-5+3a-5x+10a for combining like terms

Sixty people are invited to a party. There are 24 cup in a package and 18 napkins in a package. What is the least number of packages of cups and napkins that can be bought if each party guest get one cup and one napkin?

17 heartbeats in 15 seconds as a unit rate