do not know how to help my daughter with this type of math how do we solve this

I bought a new gas lawn mower the other day. This new mower mows faster than the old electric (environmental) one. Why, you ask? It is because the old mower cut a 21 inch path, while the new one cuts a 22 inch path. So how much time did I save? Look at some facts. My lawn is a rectangle measuring 150 feet by 105 feet I mow the lawn in strips and always in the same direction (length or width) My walking speed is 120 feet/minute It takes 5 seconds to turn around after each strip How much time did I save if I mow back and forth along the width or if I mow back and forth along the length? Pick one and figure it out. My neighbor does not like minutes the noise it makes, but I do!

Can you please show how the math is done in one of the calculations, I cannot figure out what is being done? Thanks

Can you show equations and work to please

I don't understand how to solve this problem, can you help me? the problem is 15 -6x for x=2.5

Question 3/12 > NEXT A BOOKMARK Democracy Prep has "c" number of classrooms across all the middle schools. During the State Test each classroom went through 47 pencils, p. Part A: Write an equation that could be used to find p, the total number of pencils, used in all middle school classrooms, c. Part B: If we know there are 41 classrooms in all the middle schools, how many pencils did they use during the State Test?

The homework problem asks for this to be plugged into the graphing calculator to solve for a approximate solutions for the equation, which i don't know how to do.

*look carefully to tell the difference between the two problems.