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Rudiy27
3 years ago
6

a washer and a dryer cosr $873 combined. thenwasher cost$ $77 less than the dryer . what is the cost of the dryer.

Mathematics
1 answer:
Hitman42 [59]3 years ago
5 0

Let the dryer cost x.

Then, the washer costs (x-77)

Together, they cost  (x) + (x-77) = 873

        2x-77 = 873      [subtract 77 from both sides]

           2x =    796      

            x = 398

So the dryer costs $398

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The perimeter of a rectangle is 96cm its shortest side has a length of 5cm state the length of the longest side​
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43cm

Step-by-step explanation:

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86/2 sides=43 longest side

4 0
2 years ago
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C

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Does 10,15,20 form a right triangle
sveta [45]
A right triangle can only be formed when you use the 3/4/5 rule.
The 3/4/5 rule is a^2 + b^2 = c^2.

We will use 10 for a, 15 for b, and 20 for c.

a^2 + b^2 = c^2

Plug in 10 for a, 15 for b, and 20 for c.

10^2 + 15^2 = 20^2

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15^2 = 225

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Your answer is:

No, 10,15,20 does not form a right triangle.

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5 0
3 years ago
What are the exact solutions of x2 − 5x − 7 = 0, where x equals negative b plus or minus the square root of b squared minus 4 ti
Marat540 [252]

Answer:

x = \frac{5 + \sqrt{53}}{2}  or  x = \frac{5 - \sqrt{53}}{2}

Step-by-step explanation:

Given

x^2 - 5x - 7 = 0

Required

Solve for x using:

x = \frac{-b \± \sqrt{b^2 - 4ac}}{2a}

First, we need to identify a, b and c

The general form of a quadratic equation is:

ax^2 + bx + c = 0

So, by comparison with x^2 - 5x - 7 = 0

a = 1     b = -5      c = -7

Substitute these values of a, b and c in

x = \frac{-b \± \sqrt{b^2 - 4ac}}{2a}

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x = \frac{5 \± \sqrt{53}}{2}

Split the expression to two

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To solve further in decimal form, we have

x = \frac{5 + 7.28}{2}  or  x = \frac{5 - 7.28}{2}

x = \frac{12.28}{2}  or  x = \frac{-2.28}{2}

x = 6.14 or x = -1.14

4 0
3 years ago
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