Answer:
11x-8
Step-by-step explanation:
![3(x - 2) + 2(4x - 1) \\ multiply \: inside \: the \: bracket \\ 3x - 6 + 8x - 2 \\ 11x - 8](https://tex.z-dn.net/?f=3%28x%20-%202%29%20%2B%202%284x%20-%201%29%20%5C%5C%20multiply%20%5C%3A%20inside%20%5C%3A%20the%20%5C%3A%20bracket%20%5C%5C%203x%20-%206%20%2B%208x%20-%202%20%5C%5C%2011x%20-%208%20)
14.99*.12=1.80
14.99-1.8=13.19
13.19*.0625=.94
13.19+.94=14.13
final price 14.13
Multiply price per pound by total pounds:
2.50 x 3.5 = 8.75
Total cost = $8.75
Step-by-step explanation:
- 4 and 1 are roots.
Therefore, (x + 4) & (x - 1) are factors and 5 is leading coefficient.
Therefore, required quadratic equation is:
![5 (x + 4) (x - 1) \\ = 5( {x}^{2} - x + 4x - 4) \\ = 5( {x}^{2} + 3x - 4) \\ = 5 {x}^{2} + 15x - 20](https://tex.z-dn.net/?f=5%20%28x%20%2B%204%29%20%28x%20-%201%29%20%20%5C%5C%20%20%3D%205%28%20%7Bx%7D%5E%7B2%7D%20%20-%20x%20%2B%204x%20-%204%29%20%5C%5C%20%20%3D%205%28%20%7Bx%7D%5E%7B2%7D%20%20%2B%203x%20-%204%29%20%5C%5C%20%20%3D%205%20%7Bx%7D%5E%7B2%7D%20%20%2B%2015x%20-%2020)
There’s 3 7’s in 21 2 times 3 is 6 so the answer is 6.