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Aleksandr [31]
3 years ago
8

Simplify this expression. 6^7 ÷ 6^5 A. 30 B. 35 C. 36 D. 42

Mathematics
2 answers:
bulgar [2K]3 years ago
6 0

Answer:

C 36

Step-by-step explanation:

When we have to exponents to the same base, and we are dividing them, we can subtract the exponents

a^b ÷ a^c = a^ (b-c)

6^7 ÷ 6^5 = 6^(7-5)

                 = 6^(2)

                = 36

Dima020 [189]3 years ago
3 0

ANSWER

C. 36

EXPLANATION

The given expression is

{6}^{7}  \div  {6}^{5}

Recall that,

{a}^{m}   \div  {a}^{n}  =  {a}^{ m - n}

We apply this property to get,

{6}^{7}\div  {6}^{5}  =  {6}^{7 - 5}

This will give us,

{6}^{7}\div  {6}^{5}  =  {6}^{2}

{6}^{7}\div  {6}^{5}= 36

The correct choice is C.

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We saw two distributions for triathlon times: N(µ = 4313, Ï = 583) for Men, Aged 30 - 34 and N(µ = 5261, Ï = 807) for the Wome
zzz [600]

Answer:

a) 3354 seconds

b) 6294 seconds

Step-by-step explanation:

When the distribution is normal, we use the z-score formula.

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.

(a) The cutoff time for the fastest 5% of athletes in the men's group, i.e. those who took the shortest 5% of time to finish.

\mu = 4313, \sigma = 583

The cutoff for the shortest 5% is the 5th percentile, which is X when Z has a pvalue of 0.05. So X when Z = -1.645.

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

-1.645 = \frac{X - 4313}{583}

X - 4313 = -1.645*583

X = 3354

Cutoff of 3354 seconds.

(b) The cutoff time for the slowest 10% of athletes in the women's group.

\mu = 5261, \sigma = 807

The slowest 10% is the 10% that takes more time, so the cutoff is the 100 - 10 = 90th percentile, which is X when Z has a pvalue of 0.9. So X when Z = 1.28.

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

1.28 = \frac{X - 5261}{807}

X - 5261 = 1.28*807

X = 6294

Cutoff time of 6294 seconds

5 0
4 years ago
HELP !!! Which expression is equivalent to ...
Genrish500 [490]

Answer:

D

Step-by-step explanation:

8 0
3 years ago
<img src="https://tex.z-dn.net/?f=396%20%5Ctimes52" id="TexFormula1" title="396 \times52" alt="396 \times52" align="absmiddle" c
satela [25.4K]

396

x52

  792

19800

20592

396x52=20,592

hope it helps!

5 0
3 years ago
a culinary club earns $1360 from a dinner service. they sold 45 adult meals and 80 student meals. an adult meal costs twice as m
Georgia [21]
The adult meals cost 16$ and the student meals cost 8$. A=16 and S=8. 80•8= 640 you then take eight and multiply it by two and get 16 because it says the adult meals were twice as much. 45•16= 720.
640+720= 1360
4 0
4 years ago
{[(4x9)x3]-12}x8-10^5
Troyanec [42]

Answer:

-99232

Step-by-step explanation:

PEMDAS

Solve in the brackets/parenthesis and expand out

4*9=36*3=108-12=96

Now we have (96)*8-10^5

Next up is exponents so -10^5 is -100000

Next is multiplication so  (96)*8=768

Lastly is subtraction: 768-100000= -99232

Scientific notation of this answer is -9.9232*10^4 (depends which answer they are looking for)

6 0
3 years ago
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