Henry is filling up his fish tank with water at a constant rate. At 2 minutes the water level is 16 cm. At 8 minutes the water level is at 34 cm.
O mins
what was the water level at 0 min?

If the dimensions of a rectangular prism are 5 ft x 3.5 ft x 2 ſt, what is the surface area?

Prove that 16^4-2^13-4^5 is divisible by 11.

How many 3-digit numbers can you write using only digits 1 and 7? (of course, digits can repeat.) how many 3-digit numbers can you write using only digits 1 and 7? (of course, digits can repeat.)