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gizmo_the_mogwai [7]
3 years ago
6

Solve by completing the square. X^2-2x-15=0 (help)

Mathematics
2 answers:
gladu [14]3 years ago
8 0

Step-by-step explanation:

x² - 2x - 15 = 0

x1 = 5

x2 = -3

DiKsa [7]3 years ago
3 0
The answer to this problem is (5,3)
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At the school talent show, 1/3 of the people were boys, 3/6 were girls, and the rest were adults. If there were 50 more girls th
strojnjashka [21]

Answer:

150 people

Step-by-step explanation:

Lets call the total amount of people at the talent show x. Since 3/6=1/2, we know that half the people are girls, 1/3 are boys. If we added 1/2 and 1/3 we get 5/6, 1-5/6=1/6, so now we know that 1/6 of the people are adults. Because it says "If there were 50 more girls than adults" so from that we can see that 1/2x =1/6x+50. If we were to simplify the equation, we 1/3x=50, so x=150

3 0
3 years ago
(Write an equivalent expression by applying the distributive property X+2)(x+9)
ivann1987 [24]

Answer:

Step-by-step explanation:

(x + 2)(x +9)= x*(x +9) + 2*(x +9)

                   = x*x  + x*9  + 2*x + 2*9

                   = x² +<u> 9x + 2x </u>+ 18   {Combine like terms}

                    = x² + 11x  +18

8 0
3 years ago
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a cellular telephone tower casts a shadow that is 72 feet long. while a nearby tree that is 27 feet tall casts a shadow that is
timurjin [86]
Shadow length is proportional to object height.
   (tower height)/(tower shadow length) = (tree height)/(tree shadow length)
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   (tower height) = (72 ft)*(27/6)
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The cellular telephone tower is 324 ft tall.
8 0
4 years ago
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Answer:

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4 0
3 years ago
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dimaraw [331]

Answer:

The radius of the town is 3.641 km.

Step-by-step explanation:

The density of people in the city is given by the formula:

density  = number of people / area of the city

Since the city is a perfect circle, it's area is given by:

area of the city = pi*r²

We have:

480 = 20000/pi*r²

480*pi*r² = 20000

r² = 20000/480*pi

r = sqrt(20000/480*pi) = 3.641

The radius of the town is 3.641 km.

3 0
3 years ago
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