How do multiple-regression designs address internal validity?

What are the relative frequencies to the nearest hundredth of the columns of the two-way table?

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

8. kelly wants to buy a magazine that is $25. later the magazine was marked up an additional 20%. what is the new price?