Juan has fewer than ten $10 bills. He has more than three $1 bills. He has twice as
many tens as ones. How much money
does he have?

The function a represents the cost of manufacturing product a, in hundreds of dollars, and the function b represents the cost of manufacturing product b, in hundreds of dollars. a(t) = 5t + 2 b(t) = 7t - 2t +4 find the expression that describes the total cost of manufacturing both products, a(t) + b(t). a. 7t^2 - 7t + 2 b. 7t^2 + 3 +6 c. 7t^2 + 7t - 6 d. 7t^2 - 3t + 6

Add the fractions and simplify 1/2+ 1/3

[10 points, algebra 2]according to my answer key the restrictions are -1 and 4. but why not positive 1?