If sales tax is 8.6 % find the total cost, including tax of a car stereo with a selling price of $395

428.97

Step-by-step explanation:

The first step is to find the sales tax

tax = original price * tax rate

tax = 395 * 8.6%

     = 395*.086

     =33.97

Now we need to add this to the original price

new price = original price + tax

                 =395+ 33.97

                =428.97

answer: standard form is ax^2 + bx + c = 0

step-by-step explanation:

standard form is ax^2 + bx + c = 0

(2x + 1)(x - 2) = 0

distribute to get into standard form

2x^2 - 4x + x - 2 = 0

2x^2 - 3x - 2 = 0

a = 2, b= -3, c = -2

a is your answer