hannah practices her guitar for 40 minutes on monday. on tuesday she practices for 5/8 of the time she practiced on monday . on wednesday she practices for 4/5 of the time she practiced on tuesday. how many minutes did hannah practice on wednesday ?
a. 20 minutes. b. 25 minutes
c. 30 minutes. d. 40 minutes
you in advance

Tracy solved the following problem. which of the statements is true? 9 ÷ 3 + 6 × 2 3 + 6 × 2 9 × 2 18 her answer is correct. her answer is incorrect. she should have multiplied before dividing. her answer is incorrect. she should have multiplied before adding. her answer is incorrect. she should have added before dividing.

Solve the system of equations. y= 2x y= x^2 - 15

For f(x)=2x+3 and g(x)=x^2- 8 find (f+g) (x)