Which expression is a binomial?

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.

Which of the following contains a variable?

True or false: the graph of y=f(bx) is a horizontal compression of the graph y=f(x) if b< 1