Unit 5 Hw 5 all things algebra 2014 bottom questions

I'm being volume of cylinder with 13 in. radius and 30 in height answer choices in pic

What is the sum of these mixed numbers 2 1/8 + 4 3/8

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