Round 26.55 to the nearest whole number?

Amerchant has coffee worth $60 a pound that she wishes to mix with 50 pounds of coffee worth $90 a pound to get a mixture that she will sell for $70 a pound. how many pounds of the & 60 coffee should be used?

Given the two similar triangles, how do i find the missing length? if a=4, b=5, and b'=7.5 find a'

How can you construct perpendicular lines and prove theorems about perpendicular lines