How do i write a geometry proof

The equation b=540-30m gives the balance b (in dollars) that you owe on a drum set after m monthly payments. What is the balance after 9 monthly payments?

Anumeha is mowing lawns for a summer job. For every mowing job, she charges an initial fee of $10 plus a constant fee for each hour of work. Her fee for a 5-hour job, for instance, is $35.

Ben is 20 years older than Daniel. Ben and Daniel first met two years ago. Three years ago, Ben was 3 times as old as Daniel. How old is Daniel now?

Find 4 over seven of 2415

What is the product? (8*10^2) ⋅ (2.5*10^2) a) 2*10^2 b) 2*10^3 c) 2*10^4 d) 2*10^5

The temperture in the rink must stay below 50 degrees Fahrenheit ... This morning the temperature was 71 degrees Fahrenheit. The ice rink runs a cooling device, that can decrease the temperature by 3.5 degrees every hour.

Your brother traveled 117miles in2.25 hours to come home for school break. What's the average speed that he was traveling

Marlis has 765 cards in her baseball collection. she sells 153 of cards. What is the percent of decrease in the number of cards in the collection?

399+428 make a ten or hundred to add mentally

A vehicle is traveling at a rate of 80 kilometers per hour. How many miles per hour is this?