A) 5/100 x 420 = 21
21 x 12 x 3= 756
420 x 12 x 3 = 15,120
15,120+756= 15,876
b) 4/100 x 420= $16.8
Answer:
Step-by-step explanation:
3x² - 33x + 54 = 0
Divide the whole equation by 3
x²- 11x + 18 = 0
Sum = -11
Product = 18
Factors = -9 , -2 { - 9 + (-2) = -11 ; (-9) *(-2) = 18}
x² - 2x - 9x + -9 * -2 = 0
x(x - 2) - 9(x - 2) = 0
(x-2)(x-9) = 0
x - 2 = 0 ; x - 9 = 0
x = 2 ;x = 9
Lesser x = 2
greater x = 9
The value of x in the equation from the least to the greatest is -8 and -4.
<h3>How to find the variable in an equation?</h3>

cross multiply
x - 2 = (x + 10)(x + 3)
x - 2 = x² + 3x + 10x + 30
x - 2 = x² + 13x + 30
x² + 13x - x + 30 + 2 = 0
x² + 12x + 32 = 0
x² + 4x + 8x + 32 = 0
x(x + 4) + 8(x + 4) = 0
(x + 4)(x + 8) = 0
x = -4 and x = -8
learn more on equation here: brainly.com/question/1535528
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This is the answer to the problem