How to write (1.5 x 10^-4) x (2.5 x 10^3) in scientific notation

Given that de, df, and ef are midsegments of △abc, and de=3.2 feet, ef=4 feet, and df=2.4 feet, the perimeter of △abc is .

Which statement most accurately describe why the division property of exponents does not apply to the expression (-8)^2/(-3)^4

Write an expression that has three terms and simplifies to 4x - 7. identify the coefficient(s) and constant(s) in your expression