Can you plz tell mr the answers as soon as possidle?

What is the value of the digit 1 in the number 13?

Simplify (a/b - b/a) times (a - a^2/a+b) a - a^2/a=b is a mixed number

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