Simplify these expressions.
a. 4x + 7x + (–x)
b. –5yz + yz + 2yz

What is the solution to the equation e3x=12? round your answer to the nearest hundredth

The party planning committee has to determine the number of tables needed for an upcoming event. if a square table can fit 8 people and a round table can fit 6 people, the equation 150 = 8x + 6y represents the number of each type of table needed for 150 people.

If mary had 320 toy cars and she gave her friend 50 cars and then she gave her brother 72 more cars how much toy cars would mary have left ● explain with proper details