2 years ago

A triangular shaped stack of tin cans has 8 cans in the first row and 8 rows in all. In each successive row one can is removed.

1 answer:

8 0

If n is the number of cans in row r
n = 9 - r where r is a natural number less than 9

When r = 5 then n = 9 - 5 = 4

(you could let r = 9 as the ninth row has zero cans but values above 9 will give negative counts)

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On a biased dice , the probability of getting a 6 is 4/5. The dice is rolled 500 times. How many sixes would you expect to roll?

tatyana61 [14]

Find 4/5 of 500.

4/5*500=400

You will roll 400 sixes.

5 0

3 years ago

2/3y + 15 = 9 <br> What are the steps for this question

xenn [34]

Answer:

see below

Step-by-step explanation:

2/3y + 15 = 9

Subtract 15 from each side

2/3y + 15-15 = 9-15

2/3y = -6

Multiply each side by 3/2 to isolate y

3/2 * 2/3y = -6 *3/2

y = -9

4 0

3 years ago

Read 2 more answers

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 one of the short sides of a 45-45-90 triangle equals 5, how long is the hypotenuse?

Alla [95]

Answer:

hypotenuse= 2 $\sqrt{5}$