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Paraphin [41]
3 years ago
8

A computer is on sale and is marked down 30% off regular price. After 13% tax, you pay $355.95. Calculate the regular price of t

he computer.
Mathematics
1 answer:
lorasvet [3.4K]3 years ago
7 0

Answer:

you need to use the before change and after method

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What is the remainder when 15,908 is divided by 13
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What quantity of apples would you need to make a triple recipe?
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If 2 1/4 cups of apples are needed for a single recipe, then a triple recipe would call for 3 times as many....

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4 years ago
How would I solve this?
givi [52]

Answer:

The valid value of x is x=-2

Step-by-step explanation:

we know that

The sum of the interior angles of any quadrilateral must be equal to 360 degrees

so

(7x^{2}-24x)+100+(24-46x)+(3x^{2}+56)=360

solve for x

Combine like terms

10x^{2}-70x+180=360

10x^{2}-70x-180=0

Divide by 10 both sides

x^{2}-7x-18=0

The formula to solve a quadratic equation of the form

ax^{2} +bx+c=0

is equal to

x=\frac{-b(+/-)\sqrt{b^{2}-4ac}} {2a}

in this problem we have

x^{2}-7x-18=0

so

a=1\\b=-7\\c=-18

substitute in the formula

x=\frac{-(-7)(+/-)\sqrt{-7^{2}-4(1)(-18)}} {2(1)}

x=\frac{7(+/-)\sqrt{121}} {2}

x=\frac{7(+/-)11} {2}

x=\frac{7(+)11} {2}=9

x=\frac{7(-)11} {2}=-2

Remember that

The measure of the interior angle cannot be a negative number

For x=9

we have that the measure of one interior angle of quadrilateral  is

24-46x

substitute the value of x

24-46(9)=-390\°

therefore

The value of x=9 cannot be a solution

For x=-2

The measure of the interior angles are

(7(-2)^{2}-24(-2))=76\°\\100\°\\(3(-2)^{2}+56)=68\°\\24-46(-2)=116\°

therefore

The valid value of x is x=-2

7 0
3 years ago
yul has lunch at a restaurant if his bill is $14.50 and yul want to leave 20% tip what is the amount he should leave for a tip
Mariulka [41]
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Yul should leave 20% tip of

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