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Keith_Richards [23]
3 years ago
13

Select all of the following that represent quadratic expressions:

Mathematics
1 answer:
suter [353]3 years ago
7 0
C. (x + 2)(x + 1)

it can be turned into an equation :)
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7. A model rocket is launched from a roof into a large field. The path of the rocket can be modeled by the
svp [43]

Answer: 475.59 meters .

Step-by-step explanation:

The correct equation is the following:

y =-0 .02x^2 +9.5x + 5.6

For this exercise you need to use the Quadratic formula:

x = \frac{-b\±\sqrt{b^2-4ac}}{2a}

In this case you can identify that the values of "a", "b" and "c" are:

a=-0.02\\\\b=9.5\\\\c=5.6

Now you must substitute these values into the Quadratic formula and then evaluate. You get:

x=\frac{-9.5\±\sqrt{(9.5)^2-4(-0.02)(5.6)}}{2(-0.02)}\\\\x_1=475.588\\x_2=-0.588

Choose the positive one and round it to the nearest hundreth:

x_1\approx 475.59

4 0
3 years ago
It takes Hoai 20 minutes to walk to his friend's house 7/8 mile away.<br> What is his walking pace?
algol [13]

Step-by-step explanation:

To find her walking pace in 'miles per hour', we need to divide the distance (in miles) by the time (in hours)

speed

=

distance

time

The time is given in minutes, but

50

minutes =

50

60

hours

=

5

6

hours

1

2

3

÷

5

6

=

5

3

×

6

5

miles per hour

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5

3

×

6

2

5

=

2

miles per hour

6 0
2 years ago
Read 2 more answers
El equipo mixto de fútbol tiene cuatro veces más niños que niñas. Decimos quela razón del número de niños
makvit [3.9K]

Answer:

4 a 1

Step-by-step explanation:

Se lee "4 a 1"

4 0
3 years ago
Read 2 more answers
The length of one leg of a right triangle is 3 feet more than the other leg. If the hypotenuse is 15 feet find the length of eac
melamori03 [73]

Answer:

Leg1 = 9 and leg2 = 12

Step-by-step explanation:

<u>Points to remember</u>

<u>Pythagorean theorem</u>

Hypotenuse² = Base² + Height²

<u>To find the length of each leg</u>

It is given that, hypotenuse = 15 feet

Let base = x the height = x +3

By using Pythagorean theorem we can write,

Hypotenuse² = Base² + Height²

15²  = x² + (x + 3)²

225 = x²  + x²  + 6x + 9

2x²  + 6x + 216 = 0

x²  + 3x + 108 = 0

By solving we get x = 9 and x -12

Therefore one leg = 9 and other leg = 9 + 3 = 12

5 0
3 years ago
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What is the ratio of x to y 14x = 25y
IgorLugansk [536]
14:25
x:y

i hope this helpss
7 0
4 years ago
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