The height of a triangle is 4 less than its base. The area of the triangle is 30 square inches. Find the length of the base to the nearest inch.

4 in

6 in

8 in

10 in

Isabelle is mixing red and blue paint to make purple paint she adds 3/10 of a fluid ounce of red to 12/25 of a fluid ounce of blue to make 1 1/30 fluid ounces of purple how many fluid ounces of red paint ounces of red paint will she need to make 3 fluid ounces of purple paint