Alisa is making bracelets with leather bands. each bracelet uses 7 3/4 inches of leather banding. she plans to make 4 bracelets. how many inches of leather
banding will she need?

How do i do this? i don’t understand

Awater holding tank measures 105 m long, 50 m wide, and 8 m deep. traces of mercury have been found in the tank, with a concen- tration of 60 mg/l. what is the total mass of mercury in the tank? answer in units of kg.

Aladder that is 20ft long is leaning against the side of a building. if the angle formed between the ladder and the ground is 75 degrees how far is the bottom of the from the base of the building?