15. you are buying batteries, a stereo, and some cds from the i. b. electronics store. you can buy from this store online or in a physical store. you have a coupon for 10% off that can only be used in the physical store and a $5.00 off coupon that can only be used online. the sales tax of 5% only applies to the physical store. shipping for the online store is a flat rate of $6.99. you are trying to decide whether to shop at the physical store or the online store. using the pricing information below, how much would you pay at the physical store after all discounts, taxes, and shipping fees have been applied?

Step-by-step explanation:

Let us suppose we have purchased items which cost for about 100 $

In case of offline physical store

1) we have a coupon of 10%

  so (10/100)*100 =10 $ will be the off on 100$

2)Sales tax is 5%

 tax on the total amount

(5/100)*100 =5 $

so the amount which we will pay will be  100+5-10= 95$ in case of offline physical store

In case we buy on online store

1) we have a discount coupon of 5%

 (5/100)*100 = 5$

2) Need to pay for shipping for 6.99$

100 -5 +6.99=101.99 $

so you need to pay 101.99$ in case of online store.  

maximum area = xy = (16)(32) = 512 ft2

to maximize the area of the garden, the side of the fence parallel to the side of the house should be 32 ft long, and the other two sides should both have length 16 ft.'

source

x = -3

y = -18

step-by-step explanation:

to solve by substitution, substitute one variable and solve for the other. then substitute again to find the remaining variable.

x-1/3(3x-9) = -3 since y=3x-9 substittute y.

x-1/3(3x-9)=-3

x + x +3 = -3

2x+3=-3

2x+3-3= -3-3

2x=-6

x=-3

substitute again into y=3x-9

y=3(-3)-9

y=-9-9

y=-18