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kenny6666 [7]
3 years ago
9

Which are the solutions of x2 = –7x – 8?

Mathematics
2 answers:
erma4kov [3.2K]3 years ago
4 0
Add 7x+8 to both sides
x^2+7x+8=0
use quadracit formula
x=\frac{-b+/- \sqrt{b^2-4ac} }{2a}
a=1
b=7
c=8


x=\frac{-7+/- \sqrt{7^2-4(1)(8)} }{2(1)}
x=\frac{-7+/- \sqrt{49-32} }{2}
x=\frac{-7+/- \sqrt{17} }{2}
aprox
x=-5.56155 or -1.438
Yuri [45]3 years ago
4 0

Answer:

the answer is C

Step-by-step explanation:


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The temperatures t, in burrtown starts at 32F asset midnight, when h=0. For the next few hours, the teampature drops 2 degrees e
defon
For this case, the first thing we must do is define variables.
 We have then:
 h: number of hours
 t: temperature
 We now write the equation that represents the problem.
 We have then:
 t (h) = -2h + 32
 We note that for h = 0
 t (0) = -2 (0) + 32
 t (0) = 32
 Answer:
 
An equation that represents the temperature, t, at your h is:
 
t (h) = -2h + 32
8 0
4 years ago
For an intramural sports program at a particular college, the time to run one mile is recorded for 200 male students in the prog
jeka57 [31]

Answer:

Devon has the lower z-score, so he was faster relative to his gender.

Step-by-step explanation:

Z - score

In a set with mean \mu and standard deviation \sigma, the zscore of a measure X is given by:

Z = \frac{X - \mu}{\sigma}

The Z-score measures how many standard deviations the measure is from the mean. After finding the Z-score, we look at the z-score table and find the p-value associated with this z-score. This p-value is the probability that the value of the measure is smaller than X, that is, the percentile of X. Subtracting 1 by the pvalue, we get the probability that the value of the measure is greater than X.

Who ran the mile faster relative to their gender?

Who runs in less time the mile is faster, so whoever has the lower z-score is faster relative to their gender.

Devon participates in the intramural program for men. His best time to run the mile is 6.6 minutes.

For men, these times are approximately normal with mean 8 minutes and standard deviation 1 minute.

So we have to find Z when X = 6.6, \mu = 8, \sigma = 1

Z = \frac{X - \mu}{\sigma}

Z = \frac{6.6 - 8}{1}

Z = -1.4

Kendall participates in the intramural program for women. Her best time to run the mile is 5.7 minutes.

For women, these times are approximately normal with mean 7.5 minutes and standard deviation 2 minutes.

So we have to find Z when X = 5.7, \mu = 7.5, \sigma = 2

Z = \frac{X - \mu}{\sigma}

Z = \frac{5.7 - 7.5}{2}

Z = -0.9

Devon has the lower z-score, so he was faster relative to his gender.

5 0
3 years ago
Could anyone tell me the answer of this question?<br>Pls answer fast​
Viefleur [7K]

Answer:

what is needed to be found??

3 0
3 years ago
How many seconds are in a whole week?!
Zolol [24]

Answer:

E 604,000

Have a nice day

5 0
3 years ago
A line parallel to the line 3x+4y+8=0 with y-intercept 4
Vitek1552 [10]
3x + 4y + 8 = 0
4y = -3x - 8
y = -3/4x - 2....slope here is -3/4. A parallel line will have the same slope.

y = mx + b
slope(m) = -3/4
y int (b) = 4

so ur equation is : y = -3/4x + 4
6 0
3 years ago
Read 2 more answers
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