SPANISH
help i need an answer to these question (and please one that isn't a scam)

What two criteria are needed for triangles to be similar

The volume of a cube is 8 in to the 3rd power. how long is each side?

Suppose that a households monthly water bill (in dollars) is a linear function of the amount of water the household uses (in hundreds of cubic feet, hcf). when graphed, the function gives a line with slope of 1.65. if the monthly cost for 13 hcf is $46.10 what is the monthly cost for 19 hcf?