Mrs. adams is grading a math test on rational numbers. the correct answer to one of the problems is -0.4 :

Aright triangle has an area of 21 m2. the dimensions of the triangle are increased by a scale factor of 4. what is the area of the new triangle

Find the unit rate. enter your answer as a mixed number. a fertilizer covers 2/3 square foot in 1/2 hour.

For the right triangle shown, the lengths of two sides are given. find the third side. leave your answer in simplified, radical form.