Please help with these questions and show how u found them ! i will mark you brainliest

Zoe placed colored blocks on a scale in science class. each block weighed 0.8 ounces. the total weight of all the colored blocks was 12.8 ounces. how many blocks did zoe place on the scale? write and solve an equation to find the answer.

Answer this 30 points and brainliest!

Find the slope of the line that contains the following points. r(-2, 4), s(6, -2)