Is the first question correct pls correct me if I’m wrong pls pls help on the chart and the last question which is how many hours will he have to work to get $186

Tomas is making trail mix using granola and walnuts. he can spend a total of $12 on the ingredients. he buys 3 pounds of granola that costs $2.00 per pound. the walnuts cost $6 per pound. he uses the equation to represent the total cost, where x represents the number of pounds of granola and y represents the number of pounds of walnuts. he solves the equation for y, the number of pounds of walnuts he can buy. answer- b tomas added 6 to both sides of the equation instead of subtracting 6. just took the test

Is the square root of 4 plus the square root of 16 rational?

Simplify. 3(4+4x) (type your answer in with no spaces)