What is the value of a2+0.4a for a=0.5?

What is the perimeter of a rectangular building that is 80 feet wide and 140 feet deep?

Alex measured the length of an item to be 3.7 cm. the actual length is 3.5 cm. what is alex’s percent error?

In an isosceles triangle, the vertex angle is 112 degrees. what is the measure of each base. a.34 b.24 c.44 d.54