Select all expressions equivalent to ( 4 ^ 5 ×4 to the power of negative 3) power of negative 2

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.

Pls math have no ideamultiply and simppify. 2x^2y^3z^2 • 4xy^4x^2

Which of the following values have 3 significant figures? check all that apply. a. 10.1 b. 100.05 c. 120 d. 129