What does a b and c stand for in a quadratic equation?

What's 21a + 28b factorise fully

Patrick earns $40 per hour. He earned an extra $1000 for working on a special project. His pay check for the month was 7420. How many hours did he work

David has two jobs. He earns $8 per hour babysitting his neighbor's children and he earns $11 per hour working at the coffee shop. He wants to earn a minimum of $200 this week. David worked 15 hours at the coffee shop.

The diameter of the Moon is about 3,476 km the distance from Earth to the Moon is about 384,400 km about how many moons could be lined up in a row between Earth and the Moon. Round to the nearest whole number

Plane travels 1000 miles in 5 hours and 30 minutes. What is the average speed of the plane in 1 hour?

What is the difference 4 1/3 - (-2/3)

Elaine is painting a fence. she knows that she needs 1 gallon of paint for each 10 feet of fencing. The fencing will enclose a rectangular yard that is 3 yards long and 2 yards wide. how much paint does Elaine need?

What is the square root of 2/9?

What is 75% of 200?

A coach on a basketball team ordered jerseys for each player. Each one cost $12.95. The shipping charge for the entire order was a one-time fee of $20. The coach spent under $125 for the shirts and the fee.