3) arlene purchased a desk set for $680. (a) how much sales tax did she pay if the tax rate is 6.5%? (b)
what was the final cost of the desk set?
deare
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o a.) (a) $45.20, (b) $723.20
pb.) (a) $44.20, (b) $724.20
• c.) (a) $43.20, (b) $725.20

  b.) (a) $44.20, (b) $724.20

Step-by-step explanation:

(a) The tax is 6.5% of the price of the desk set, so is ...

  0.065 × $680 = $44.20 . . . tax

Once you have this, you know the correct answer choice.

__

(b) $44.20 +680.00 = $724.20 . . . total cost

a

step-by-step explanation:

(5x-1)^2= (5x)^2-2(5x)×1+(1)^2=25x^2-10x+1