Omar classroom has 2 closets .each closet has 3 shelves. there are 5 backpack on each self how many backpack are there in all?

For how answer my question this will be the last question can you answer in math subject

Lucy and donavan measured the length of the school garden. lucys measurement is 11.3m and donavans measurement is 113 cm. could both be correct? explain

Ab and bc are tangent to circle d. find x is ab = 3x + 8 and bc = 26. find x