Marcus spent $16 on batteries if they cost $2 per pack how many packs did he buy what's the variable in the equation ​

6x - 8 = 16 solve the following equation. then place the correct number in the box provided.

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

Choose the more precise measurement. 26.4 cm or 8.39 cm