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Eduardwww [97]
3 years ago
5

Answer this please... brainliest.........

Mathematics
2 answers:
Jet001 [13]3 years ago
8 0

Answer:

A.  Jane's friend found that 20% of 40 is 8.  Then she added $8 to the sale price: 40 + 8 = 48.  Then she determined that the original amount was $48.

B. Jane's friend was incorrect.  Because Jane saved 20%, she paid 80% of the original amount, so that means that 40 is 80% of the original amount.

Naya [18.7K]3 years ago
6 0

Answer:

Her friend is correct

Step-by-step explanation:

40 * 20% = 8

40+8=48

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If f(3)=8 and f'(3)=5 what do you know about f^-1​
Phoenix [80]

24 is the answer for(3)=8

15 is the answer for (3)=5

8 0
3 years ago
Twenty five heat lamps are connected in a greenhouse so, that when one lamp fails, another takes over immediately (only one lamp
olga55 [171]

Answer:

P = 0.006

Step-by-step explanation:

Given

n = 25 Lamps

each with mean lifetime of 50 hours and standard deviation (SD) of 4 hours

Find probability that the lamp will be burning at end of 1300 hours period.

As we are not given that exact lamp, it means we have to find the probability where any of the lamp burning at the end of 1300 hours, So we have

Suppose i represents lamps

P (∑i from 1 to 25 (X_i > 1300)) = 1300

= P(X^{'}> \frac{1300}{25})                  where X^{'} represents mean time of a single lamp

= P (Z> \frac{52-50}{\frac{1}{\sqrt{25}}})                Z is the standard normal distribution which can be found by using the formula

Z = Mean Time (X^{'}) - Life time of each Lamp (50 hours)/ (SD/\sqrt{n})

Z = (52-50)/(4/\sqrt{25}) = 2.5

Now, P(Z>2.5) = 0.006 using the standard normal distribution table

Probability that a lamp will be burning at the end of 1300 hours period is 0.006

4 0
3 years ago
Need help please guys
Ierofanga [76]

Answer:

B.

Explanation:

π ≈ 3.142

22/7 ≈ 3.143

square root of ten ≈ 3.162

7 0
3 years ago
Read 2 more answers
PLEASE HELP! WILL MARK BRAINLIEST !!
alukav5142 [94]

Answer:

I believe the answer is B

Step-by-step explanation:

7 0
2 years ago
There are 63 books in Mrs. McGhee’s class library. Some books are paperback, and some are hard cover. There are 23 paperback boo
alukav5142 [94]

Answer:

23 and 40

Step-by-step explanation:

6 0
3 years ago
Read 2 more answers
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