Which expressions result in a product that has a best estimate of 80? select all that apply. a. 0.82 x 112 b. 42.3 x 21 c. 1.2 x 78 d. 0.19 x 37 e. 8 x 9.62

Can someone check if i did this right since i really want to make sure it’s correct. if you do you so much

Donald has x twenty-dollar bills and 11 ten-dollar bill. how much money does donald have? write your answer as an expression.

Add, subtract, multiply, or divide as indicated. list any restrictions for the variable(s) and simplify the answers when possible. 1) x-2 / x+5 + 3x / 2x-1 2) x+6 / x-6 - x^2 / x+6 3) x+9 / x-4 + x+2 / x^2-11x+28 4) x / x^2-64 + 11 / 2x^2+11x-40 5) 5 / x + 11 / x-3 - x-4 / x^2+2x-15