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krok68 [10]
3 years ago
9

The only solution of the equation x2 + bx + 16 = 0 is x = 4. What is the value of b?

Mathematics
2 answers:
denis23 [38]3 years ago
4 0

Answer:

88

Step-by-step explanation:

x2+bx+16=0

4x2+16x4+16=0

8+64+16=0

72+16=0

88

Jlenok [28]3 years ago
4 0

Answer:

guys the answer is c.. on EDG at least trust me i just did it

Step-by-step explanation:

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Answer:

C) 7c+6s-63

Step-by-step explanation:

set up this equation because you are adding the two expressions

7c-18+6s-45

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7c+6s-63

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3 years ago
To test the impact performance of a 10 cm thick gymnastics mat, a 20 kg cylindrical
denis23 [38]

Answer:

A)196J

B)-208J

C)3467J

Step-by-step explanation:

We are given that a 20 kg cylindrical  mass is dropped onto the mat from a height of 1 m above the mat. During the impact,  the cylinder’s vertical velocity reaches zero at the instant the mat has compressed to  only 4 cm thick.

So, The Mat gets compressed by : 10cm - 4 cm = 6 cm=0.06 m

a)

Using Conservations of energy

Potential energy at the top = Kinetic energy at the point before touching the surface

Kinetic energy = mgh= 20 \times 9.8 \times 1 = 196 J

b)

Work done  by the mat do to stop the fall of the cylinder =-mg(h+0.06)=-20 \times 9.8(1+0.06)=-208 J

C)

Work done=\text{Average force} \times \text{ Compression of mat}

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F=3467J

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3 years ago
There are 450 students at Central Middle School. In a survey, 90 of the student chose math as their favorite subject. What perce
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Step-by-step explanation:

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ser-zykov [4K]

Answer:

∠?=40°

Step-by-step explanation:

Remember that in a line AND a triangle there are <u>180 degree</u>s.

You correctly found the third angle in the left triangle to be 69°, Now plug it into the equation for a line, including 71°:

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1) Combine the degrees:

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2) Subtract 140° from both sides:

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To find the angle labeled "?" You must plug in all of the known angles of the triangle to be equal to 180°:

40°+100°+x=180°

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3 years ago
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