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Anuta_ua [19.1K]
4 years ago
15

The sales tax in one state is 7% .Write a function rule for the total cost of an item with selling price x.Then find the total c

ost of a CD player with a selling price of $150.
A) f(x)= 0.07x;$10.50
B) f(x)= 1.07x; $160.50
C) f(x)= 7+x;$151.07
D) f(x)= x-7; $148.93

Mathematics
1 answer:
maw [93]4 years ago
8 0
A because all percentages has 0.00 and if u take that and times it by that number you will get the price that u want
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Answer:

x: {-3, 5}

Step-by-step explanation:

Step 1. Find least common denominator

Step 2. Multiply missing factors on top AND bottom

Step 3. Combine like terms

Step 4. Simplify (get rid of denominator)

Step 5. Solve for x

\frac{x}{x-5} +\frac{3}{x+2} =\frac{7x}{x^2-3x-10}            LCD = x^2-3x-10   OR  (x-5)(x+2)

\frac{x}{x-5}(\frac{x+2}{x+2})  +\frac{3}{x+2}(\frac{x-5}{x-5})  =\frac{7x}{x^2-3x-10}

\frac{x(x+2)}{(x-5)(x+2)} +\frac{3(x-5)}{(x+2)(x-5)} =\frac{7x}{(x-5)(x+2)}

\frac{x(x+2)+3(x-5)}{(x-5)(x+2)} =\frac{7x}{(x-5)(x+2)}

\frac{x^2+2x+3x-15}{(x-5)(x+2)} =\frac{7x}{(x-5)(x+2)}

\frac{x^2+5x-15}{(x-5)(x+2)} =\frac{7x}{(x-5)(x+2)}

x^2+5x-15=7x

x^2-2x-15

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