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vredina [299]
2 years ago
9

7. You forgot to study for your quiz today in Mr. Donald's class. It is a multiple-choice test with 6

Mathematics
1 answer:
Arturiano [62]2 years ago
8 0
I don’t know but I hope you have a good day
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(Very urgent i could die help) Simone ran on a tredmail for a 6 mile per hour pace if she ran 8 miles at the same rate how long
vodka [1.7K]

Answer:

1 hour and 20 minutes

Step-by-step explanation:

6mph= 6 miles every hour

1 mile = 10 minutes

2 miles = 20 minutes

8 miles = 1 hour and 20 minutes

7 0
3 years ago
Type the correct answer in each box. (____)
trapecia [35]

Answer:

1. -16; 2. +64; 3. 16

Step-by-step explanation:

The formula for the volume of a cylinder is

V = πr²x

Data:

r = (x - 8)   mm

V = 1024π mm³

Calculations:

1. Find the cubic equation  

V = πr²h

1024π = π(x - 8)² × x

Divide each side by π

1024 = x(x - 8)²  

1024 = x(x² - 16x  + 64)

1024 =    x³ - 16x² + 64x

x³ - 16x² + 64x - 1024 = 0

2. Solve the cubic equation

The general formula for a third-degree polynomial is

f(x) = ax³ + bx² + cx + d

Your polynomial is  

f(x) = x³ - 16x² + 64x - 1024

a = 1; d = -1024

According to the <em>rational roots theorem</em>, the possible roots are

factors of d/factors of a

Factors of d = ±1, ±2, ±4, ±8, ±16, ± 32, ± 64, ±128, ±256, ±512, ±1024

Factors of a = ±1

Potential roots are x = ±1, ±2, ±4, ±8, ±16, ± 32, ± 64, ±128, ±256, ±512, ±1024

That's a lot of possibilities to check by trial and error. I will just use the one that works.

Try x = 16 by synthetic division.

16|1  -16   64  -1024

  <u>|     16     0   1024 </u>

   1     0   64        0

So,

(x³ - 16x² + 64x - 1024)/(x – 16) = x² + 64

and

(x - 16)(x² + 64) = 0

x - 16 = 0        x² + 64 =    0

     x = 16       x²         = -64

                       x          =  ±8i

There is only one real root: x = 16 mm

6 0
3 years ago
Find the percentage of decrease from 95 to 60
balu736 [363]
The answer is about 36.9%
I just guessed and checked. 95-60= 35
So .3685×95 is the closest to equaling 35
6 0
3 years ago
The tree diagram represents an experiment consisting two trials
zavuch27 [327]

Answer:

0.35

Explanation:

  • P ( B and D )
  • 0.5 * 0.7
  • 0.35

<u>Follow the branch B and then branch D</u>

  • multiply both the selected probabilities to calculate total probability.

6 0
2 years ago
Read 2 more answers
Pls give an answer to <br> 7 (-2x+4)=-4x
Leto [7]
2.8

-14x+28=-4x
10x=28
X=2.8


Mark brainliest please
7 0
3 years ago
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