2 years ago

The square of a number decreased by 15 is twice the number. find the number

Mathematics

1 answer:

jonny [76]2 years ago

6 0

Answer:

x = 5, -3

Step-by-step explanation:

x² - 15 = 2x

x² - 2x - 15 = 0

(x - 5)(x + 3) = 0

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konstantin123 [22]

Answer:

31.53

Step-by-step explanation:

6% of 525.50 is 31.53

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2 years ago

Dana can type nearly 90 words per minute. Use this information to find the number of hours it will take her to type 2.6 x 105 wo

Vlad1618 [11]

Dana can type 90 words per minute.

Since, 1 minute = $\frac{1}{60}$ hours

Therefore, number of words she can type = $\frac{90}{\frac{1}{60}}$

= 90×60

= 5400 words per hour

If she types $2.6\times 10^5$ words in 'x' hours.

Number of words Dana types with the given speed in 'x' hours = Speed of typing × Time

= $5400\times x$

Therefore, $5400\times x =2.6\times 10^5$

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$x=\frac{260000}{5400}$

$x=48.15$ hours

Therefore, Dana types $2.6\times 10^5$ words in 48.15 hours.

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brainly.com/question/621754

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Bezzdna [24]

Answer:

The answer is B.) mate

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2 years ago

Suppose you spend $23, and you pay with a $50 bill. The cashier gives your change in bills. List all the different ways you can

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2 years ago

Find the value of x round to the nearest tenth

zzz [600]

Answer:

4.1 cm

Step-by-step explanation:

The segment marked x bisects the chord, so the triangle shown has legs x and 7.8, and hypotenuse 8.8.

The Pythagorean theorem can be used to find x:

8.8² = x² +7.8²

x² = 8.8² -7.8² = 77.44 -60.84 = 16.60

x = √16.6

x ≈ 4.1 . . . cm

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2 years ago