3 subtract 1 and 1/2 C ​

If x + 10 = 70, what is x? a. 40 b. 50 c. 60 d. 70 e. 80

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

For what values of the variable x is the expression square root of 7x+14+ square root of 7-x a real number?