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Crank
3 years ago
12

Find the value of a and b in x^2+2x=13

Mathematics
1 answer:
zheka24 [161]3 years ago
8 0

Answer:

a =1  and b =2

Step-by-step explanation:

The standard quadratic is written in the form

ax^2 +bx+c =0

x^2 +2x -13 =0

a =1  and b =2

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A cube has a side length of 5xcm. What is the volume of the cube?<br>no links please.​
finlep [7]

Answer:

125 cm

Step-by-step explanation:

V=lwh

all cube has the same length, width, height

5 * 5 * 5 = 125

Hope this helps

7 0
3 years ago
A contradiction has no solutions. True or False?
Eddi Din [679]

Answer:

false

Step-by-step explanation:

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35% chance is my estimation
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3 years ago
What is the perimeter of the rectangle? Plato
charle [14.2K]

it depends how long the width and the length is. If the length is 5 cm and the width is 4 cm the perimeter will be 18cm. All you have to do is 5 doubled because there 2 sides for the length and 4 doubled because there are 2 sides for the width. I hope I have answered your question. XD

3 0
3 years ago
Read 2 more answers
A sign standing 6 feet tall is situated 18 feet away from a flag pole. at a certain time of day the sign's shadow is 3 feet long
alexdok [17]
Observe attached picture.

On picture we have:
A = height of flagpole = x ft
B = length of flagpole's shadow = 24 ft
C = height of sign = 6 ft
D = length of sign's shadow = 3 ft

When we draw a picture representing this problem we can also add another line marked in red. This way we can see that we have two right-angle triangles. We can see that both have same angle marked with α.

We can apply trigonometry rules to find height of flagpole.

From small triangle containing sign we can find tangens function:
tan \alpha = \frac{C}{D}
Similarly we can do for large triangle containing flagpole:
tan \alpha = \frac{A}{B}

We see that these two equations have same left sides. This means that their right sides must also be same:
\frac{C}{D} = \frac{A}{B}
We can solve for A:
CB=AD \\ A= \frac{CB}{D}  \\ A= \frac{6*24}{3}  \\ A=48 ft

Height of flagpole is 48 feet.

8 0
3 years ago
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