Please help with this questions. Also if you see any questions with the link, please report.

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.

Brent wants to know what is 5 x 1/2

5(-9w) put expression in distributive property