3 years ago

Find the radius of a circle whose area is 78.6 cm squared

Mathematics

2 answers:

vredina [299]3 years ago

7 0

Its 39.15
tell me if I'm wrong

kifflom [539]3 years ago

4 0

The radius is 4.99, im sure

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Jake rode his roller skated 2 1/4 miles for 3/4 of an hour. Find his skating speed in miles/hour

alisha [4.7K]

Answer:

3 mph

Step-by-step explanation:

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2 years ago

What is -1/6 multiplied by 6

Tems11 [23]

Answer:

$-1$

Step-by-step explanation:

<u>Step 1: Multiply </u>

$-\frac{1}{6} * \frac{6}{1}$

$-\frac{1*6}{6*1}$

$-\frac{6}{6}$

$-1$

Answer: The correct answer is -1

4 0

2 years ago

Please help me my homework is due tomorrow use the screen shot

Ad libitum [116K]

Answer:

1/5

Step-by-step explanation:

(5^7*5^5)/5^13 (when multiplying numbers with the same base, add the exponents)

= (5^12)/5^13 (when dividing exponents with the same base, subtract the exponents)

= 1/5^1 (anything to the first power is itself)

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2 years ago

The nth term of the sequence is n^2 + 20 <br> How many terms in the sequence are less than 50

Alex Ar [27]

Answer:

5 terms

Step-by-step explanation:

nth term of the sequence =n^2 + 20

an= n^2 + 20

1st term when n= 1

1^2 + 20= 20

2nd term n= 2

2^2 + 20=24

3rd term when n= 3

3^2 + 20= 29

4th term when n= 4

4^2 + 20= 36

5th term when n= 5

5^2 + 20 =45

6th term when n= 6

6^2 + 20=56

Hence, terms in the sequence are less than 50 are first 5 terms

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3 years ago

The scores on a psychology exam were normally distributed with a mean of 60 and a standard deviation of 10 . A failing grade on

tensa zangetsu [6.8K]

Answer:

The cutoff for a failing score was 40,

Approximately 2.3% of the students failed.

Step-by-step explanation:

Given,

Mean, $\mu=60$

Standard deviation, $\sigma=10$

Let x represents the cutoff for a failing score,

Thus, according to the question,

$\frac{x-\mu}{\sigma}=-2$

$\frac{x-60}{10}=-2$

$x-60=-20$

$x=-20+60$

$x=40$

Thus, the cutoff for a failing score is 40,

∵ P(<-2) = 0.02275 = 2.275 % ≈ 2.3 %

Hence, Approximately 2.3 % of the students failed. 

7 0

3 years ago