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7nadin3 [17]
3 years ago
13

An electronic roller makes 960 turns in 20 seconds

Mathematics
1 answer:
Luba_88 [7]3 years ago
5 0

48 turns a second, and 2,880 turns a minute.

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Write (8 x 10) + (6 x 1) +(2 x 0.1) + (7 x 0.001) with words.
aleksklad [387]

Answer:

Eight times ten plus six times one plus two times one-tenth plus seven times one-thousandth.

Step-by-step explanation:

(8 x 10) = eight times ten

(6 x 1) = six times one

(2 x 0.1) = two times one-tenth

(7 x 0.001) = seven times one-thousandth

I am not always the best with the equations to words stuff, so please comment if I am wrong!

4 0
2 years ago
Denise is a professional swimmer who trains, in part, by running. she would like to estimate the average number of miles she run
SSSSS [86.1K]
Given:
n = 20, sample size
xbar = 17.5, sample mean
s = 3.8, sample standard deiation
99% confidence interval

The degrees of freedom is 
df = n-1 = 19

We do not know the population standard deviation, so we should determine t* that corresponds to df = 19.
From a one-tailed distribution, 99% CI means using a p-value of 0.005.
Obtain
t* = 2.8609.

The 99% confidence interval is
xbar +/- t*(s/√n)

t*(s/√n) = 2.8609*(3.8/√20) = 2.4309
The 99% confidence interval is
(17.5 - 2.4309, 17.5 + 2.4309) = (15.069, 19.931)

Answer: The 99% confidence interval is (15.07, 19.93)
4 0
3 years ago
If 31,000 citizens died in an automobile accidents in 2015. how many died each hour
stira [4]
Work out the number of hours in  1 year:-

1 year = 365*24 = 8760

So the number dying each hour = 31,000 / 8760 = 3.54 
6 0
4 years ago
Read 2 more answers
(a) Write an expression for a number that is<br> three more than r.<br> .
navik [9.2K]

Answer:

r+3

Step-by-step explanation:

r is an expression. To get an expression that is 3 more, just add 3

r+3

7 0
2 years ago
HELP PLSSSSS!!!! ITS OVERDUE AND I NEED HELP FOR THE ANSWER TO B!! CAN SOMEONE ALSO TELL ME IF I GOT A RIGHT?? sorry for all cap
ludmilkaskok [199]

Step-by-step explanation:

A is 16.9%

B is 352,181

nqjxjdnwndjjdwnssj (this is spam so that i have enough characters)

8 0
3 years ago
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