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lorasvet [3.4K]
3 years ago
13

X^2-7x+7y-y^2 Factor (pls explain)

Mathematics
1 answer:
kondaur [170]3 years ago
5 0

Answer: x(x-7)+y(7-y).

X and Y are common factors so you can factor both out and get this.

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Susan runs 22 km in 2 hours and 45 minutes. What is her average speed in km an hour?
12345 [234]

Answer:

4.97097

Step-by-step explanation:

3 0
4 years ago
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Fifteen years later, a man will be two times as old as he was 15 years ago. How old is he now?
Inga [223]

Answer:

Let the present age of the man be x years.

Age of the man 15 years ago =(x−15) years and

Age of the man 15 years later =(x+15) years

According to the given condition, we have

(x+15)=2(x−15)

⇒x+15=2x−30

⇒x−2x=−30−15

⇒−x=−45 or x=45 years

Hence, the present age of the man is 45 years.

Step-by-step explanation:

Hope it helps you..

Your welcome in advance..

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6 0
3 years ago
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Sarah interviewed for a job that promised her a starting salary of $37,000
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3 0
3 years ago
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Write and solve the equation to find the value of x and the missing angle measures.​
MrRissso [65]

Answer:

x = <u><em>8</em></u>

The missing measures are <em><u>85</u></em> degrees

Step-by-step explanation:

Since 9x + 13 and 11x - 3 are on opposite sides, they are equal, so

9x + 13 = 11x - 3

Subtract 13 from both sides:

9x = 11x - 16

Subtract 11x from both sides:

-2x = -16

Divide both sides by -2:

x = 8

The angle measures are

9(8) + 13 = 72 + 13 = 85

11(8) - 3 = 88 - 3 = 85

6 0
3 years ago
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A town has a population of 4000 and grows at 3.5% every year. To the nearest year, how long will it be until the population will
Romashka [77]

18.273 years will take to reach the population of 7500, if a town has a population of 4000 and grows at 3.5% every year.

Step-by-step explanation:

The given is,

             Population of 4000

             Rate of grow 3.5% every year

             Population after few years 7500

Step:1

            Formula to calculate the population with the grow rate every year,

                                   F=P(1+r)^{t}..........................(1)

           Where,

                    F - Population after t years

                   P - Initial population

                    r - Rate of grow

                    t - No.of years

          From given,

                  F = 7500

                  P = 4000

                   r = 3.5%

        Equation becomes (1),

                    7500=4000(1+0.035)^{t}

                     \frac{7500}{4000} = (1+0.035)^{t}

                   1.875 = (1+0.035)^{t}

                   1.875 = (1.035)^{t}

       Take log on both sides,

              log 1.875 = (t)log 1.035

       Substitute log values,

                 0.2730= (t) 0.014940349

                          t = \frac{0.273}{0.014940349}

                             = 18.273

                          t = 18.273 year

                             or

                         t = 18 years 3 months 2 weeks

Result:

          18.273 years will take to reach the population of 7500, if a town has a population of 4000 and grows at 3.5% every year.

7 0
4 years ago
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