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3 years ago

Determine whether the given ordered pair is a solution of the equation. x2 + y2 - 8x + 8y = -7; (4, -1)

Mathematics

1 answer:

adelina 88 [10]3 years ago

4 0

No, it is -34 because you have to plug in 4 for x and -1 for you and do order of operations.

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You want to buy a new winter coat that originally costs $115. The coat was marked down to $86.25 so you bought it. What percent

romanna [79]

Answer:

Step-by-step explanation:

The regular price is $62.50.

Explanation:

If the sale price is $50, and the sale is 20% off, that means the $50 represents the other 80% of the regular price—the part that you do pay. So then we ask ourselves, okay, $50 is 80 percent of... what? In math speak, that would be written as

$50(is)80%(of)(regular price)

$50=80% × r

Solving this for r, we get

r=$5080%

We remind ourselves that the "percentage" symbol is just a shorthand for "divide this number by 100." The equation becomes

r=$5080/100=$500.8=$62.50

So the regular price is $62.50.

Bonus:

A general formula can be used for any regular price r, any percent discount p, and any sale price s:

p%off of reg.price is sale price

(100−p)%× r = s

As long as we know two of the three variables {p,r,s}, we can solve for the third one.

Learn more : brainly.com/question/tcs1299821

4 0

3 years ago

Read 2 more answers

6. Simplify: n - 12 + 4n+ 2 - 3n<br> A) -8n<br> B) 10n + 14<br> C) 2n - 10<br> D) 2n + 10

ad-work [718]

Answer:

answer c

Step-by-step explanation:

n plus 4n is 5n minus 3 is 2n

-12 plus 2 is -10

3 0

3 years ago

2^x . 3^x =200 solve the x

Iteru [2.4K]

$2^x\cdot 3^x=200\\\\(2\cdot3)^x =200\\\\6^x=200\\\\x=\log_6200\\\\x=\dfrac{\ln 200}{\ln 6}\\\\x\approx2.96$

5 0

4 years ago

At 1 p.m., the number of cars in a parking lot is 78. Given the formula found in the first part of the question, An=78⋅1.09n, es

Harrizon [31]

Answer:

At 6 p.m., the number of cars in a parking lot is 120

Step-by-step explanation:

At 1 p.m., the number of cars in a parking lot is 78.

Given,

$A_n=78\cdot 1.09^n$

Note that

$A_0=78\cdot 1.09^0=78\cdot 1=78$

So, 1 p.m. goes for n = 0, then

6 p.m. goes for n = 5

Thus,

$A_5=78\cdot 1.09^5\approx 120$

4 0

3 years ago

In a coordinate system, points A(-2,3) and B(6,-1) have a midpoint of X. What is the midpoint between A and X?

mamaluj [8]

Answer:

M (0,2)

Step-by-step explanation:

The coordinates of the mid point of mid point of AB (X,Y)

X =Ax - 1/4 * (Ax + Bx) = 1/4 * (2 + 6) = 2 ... Ax and Bx at opposite side of 0

Y = 1/4 * (3 + 1) = 1 ....... Ay and By at opposite side of 0

M (0,2)

7 0

4 years ago