Which property was used to simply the expression 3c+9+4c=3c+4c+9

Solve: 2|x + 7|-4 ≥ 0 Express the answer in interval notation.

Can 36/45 be simplified

Two balloons, Balloon A and Balloon B, have a total volume of 7/9 gallons. Balloon A has a greater volume than Balloon B. The difference of their volumes is 5 / 9 gallons.

The population of bacteria in a culture grows at a rate proportional to the number of bacteria present at time t. after 3 hours it is observed that 600 bacteria are present. after 10 hours 4000 bacteria are present.

How do you use equivalent rates in the real world?

Patrick is doing a card trick using a standard 52-card deck with four suits: hearts, diamonds, spades, and clubs. He shows his friend a card, replaces it, and then shows his friend another card.

The temperature dropped 13 degrees in in 7 hours. the final temperature was - 2 degrees. what was the starting temperature?

What expression is equivalent to 18c^8 d^9/9c^3 d^6

How do I find the missing numbers in this problem - 7 * _ 8 r3

The height of a ball is modeled by f (x) = - 16x^2 + 128x, where x is the number of seconds after the ball is hit. How long is the ball in the air?