Abookstore has a sale: jim wants to buy two books for $10.00 each. by what percent is the total cost of the two books reduced during the sale?

Idont get this question can someone me solve it? ** the distance light travels in one second (1 light second) is about 1.86 ×10^5 mi. saturn is about 475 light-seconds from the sun. about how many miles from the sun is saturn..my guess is 8.83* 10^7 you so much

Given the two similar triangles, how do i find the missing length? if a=4, b=5, and b'=7.5 find a'

If you measured the width of a window in inches and then in feet with measurement would you have the greater number of units