Average rate of change for f(x)= 2^-.25 x sin(3.14159/2x)

Find the solution of this system of equation -7x+y=-20 9x-3y=36

Jamie went to home depot.she bought 25 bags of soil that cost $9 per bag.she bought 15 pots at $8 each,and she bought 23 bags of pebbles at $15 each.she used a coupon that gave her $5 off for every 100 dollars she spent.how much did jame pay at the end?

Write a fraction less than 1, which has a denominator of 6 and is greater than 3/4 plz answer !