Expand and simplify (x+4)(x-7)

Acircle has a circumference of 7.850 units. what is its radius?

(60 points) explain this in detail

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