Kala’s family is shopping for a large screen tv. the tv they decided on has a retail price of $1,000 at four stores. the state sales tax is 5%. each store is offering a different sales promotion, as listed in the table. store promotional offer a $80 rebate b 10% discount on price c store pays all sales tax d $40 rebate with store paying half of sales tax which store has the best deal? store a store b store c store d

Store B has the best deal.

Step-by-step explanation:

We have been given that Kala's family decided to purchase a large screen TV, whose price is $1,000 at four stores. The state tax is 5%.

Let us find the price offered by each store.

Store A offers $80 rebate. So the price offered by store A will be price of TV plus sales tax minus rebate.

Therefore, price offered by store A is $970.

Store B offers 10% discount on price, so price offered by store B will be price of TV minus discount plus sales tax on the TV after discount.

Therefore, price offered by store B is $945.

Store C will pay all sales tax, so price offered by store C will be price of TV that is $1000.

Therefore, price offered by store C is $1000.

Store D offers $40 rebate with store paying half of sales tax, so the price offered by store D will be $1000 plus half of the sales tax minus rebate.

Therefore, price offered by store D is $985.

We ca see that price offered by store B is less than other stores, therefore, store B has the best deal.

if the eqn of the parabola is f(x) = (x-4)(x+2), we need to mult. this out to find the coordinates of the vertex.

then f(x) = x^2 + 2x - 4x - 8, and f(x) = x^2 - 2x - 8.

one way in which you can find the vertex is to calculate x = -b / (2a).   here, that comes to

        )

x = = 1.   f(1) = 1^2 - 2(1) - 8 = - 9.   vertex is at (1, -9).

        2(1) 

find another point on the curve:   let x=0, for which y=-8.   then (0, -8) is on the curve.   plot the vertex and this point and draw a smooth parabola thru both.

hope this