How to solve 2-z/4+5z•3/z as a rational expression

A car can travel 300 miles on 10 gallons of gas. The ratio is 300 miles to 10 gallons. Write the ratio given in the problem. Divide both quantities in the ratio by the second quantity in the ratio and write the new ratio.

There are 21 plates of tomato sandwiches, 27 plates of cheese sandwiches, and 12 plates of beef sandwiches on a buffet table. If a guest randomly picks a single plate, what is the probability that he gets tomato or cheese sandwiches? Show your work.

The sales tax is $9.12 on the purchase of a patio set that sells for $456. What is the sales tax rate?

Tammy is participating in a 5 - day cross-country biking challenge. She biked for 63, 50, 63, and 60 miles on the first four days. How many miles does she need to bike on the last day so that her average (mean) is 60 miles per day?

What is the answer to r/41 = 250

Ted walked 5/8 mile to his soccer game then he walked 3/8 mile to his friends house which distance is shorter

How do you factor 1-r^2

Elimination method using multiplication:3x+2y=0 and x-5y=17

Is - 4^2< (-4) ^2 a false statement

Can a triangle be formed with the side lengths of 8 cm 15 cm and 17 cm