Roy buys a coat for $86.40 which includes an 8% sales tax which equation could you use to find the cost of the coat, c, without the sales tax

86.40  =  c  + 0.08 c  is the equation which can be used to find the cost of the coat, c, without the Sales tax

Step-by-step explanation:

Let us assume the cost of the coat = c

Selling price of coat = $86.40

The sale tax on the coat = 8%

⇒ The sale tax = 8% of c

Calculating the sales tax, we get:

or, the sales tax amount on the cost price of coat = 0.08 c

Now, the Sales Price of coat =Cost Price of Coat + sales Tax Amount

⇒ $86.40  =  c  + 0.08 c

Hence,  86.40  =  c  + 0.08 c  is the equation which can be used to find the cost of the coat, c, without the Sales tax.

expression #3 is not equivalent. the others are.

x > 1.3

step by step:

8.5−0.9x> 9.8−1.9x

step 1: simplify both sides of the inequality.

−0.9x+8.5> −1.9x+9.8

step 2: add 1.9x to both sides.

−0.9x+8.5+1.9x> −1.9x+9.8+1.9x

1x+8.5> 9.8

step 3: subtract 8.5 from both sides.

1x+8.5−8.5> 9.8−8.5

1x> 1.3

step 4: divide both sides by 1.

1x/1 > 1.3/1