can someone tell me what these are? 2a-5b=-19 3a+5b=9

A plumber charges an initial fee of $200 plus an hourly fee of $50. Mr. Collins paid the plumber $450. How many hours did the plumber work?

Given the quadratic equation below, determine which situation it could represent? x2 - 4x = 60

Ingedients to make 16 gingerbread men 180 g flour 40 g ginger 110 g butter 30 g sugar What do u need to make 24

Eight members of the science club equally share 3 pizzas what part of a pizza did each members receive

What are the next number pattern 1,4,13,40,121

A car salesman sells cars with prices ranging from $5,000 to $45,000. The histogram shows the distribution of the numbers of cars he expects to sell over the next 10 years.

Each basketball player runs 25 laps around the court during each practice. Which player has completed exactly of the distance for this day of practice?

A ball is dropped from a height of 30 feet and each time it hits the ground it bounces 0.75 of the previous height. What is the height of the ball after it makes its third bounce? Round to the nearest hundredth of a foot

Natasha is measuring the angles of a triangle. She measures the first two angles and gets 60° and 80°. What should be the measure of the third angle? A) 10° B) 20° C) 40° D) 220°

Russel and Aaron can build a shed in 8 hours when working together. Aaron works three times as fast as Russel. How long would it take Russel to build the shed if he were to work alone?