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2 years ago

When cubing a number, you have to...

Mathematics

2 answers:

EastWind [94]2 years ago

5 0

Answer:

multiply the number its self 3 times , for example 3x3x3=27 = 3^3

Step-by-step explanation:

Whitepunk [10]2 years ago

4 0

Answer:

you have to multiply the number by itself 3 times

Step-by-step explanation:

can i get brainliest? i only need 2 more

You might be interested in

Which step is nigels mistake

sp2606 [1]

Answer:

step 1

Step-by-step explanation:

step 1 he made the mistake

should have been:

h - 2 = 20

7 0

2 years ago

What is the value of f(x) = –x2 – 2 when x = –1?

djyliett [7]

0 because the -x cancels out the ones negative and 1 x 2 is 2. And 2-2 is 0

8 0

2 years ago

A college student is interested in investigating the TV-watching habits of her classmates and surveys 20 people on the number of

Alla [95]

Answer:

80% confidence interval of the true average number of hours of TV watched per week is [8.28 hours, 11.02 hours].

Step-by-step explanation:

We are given that a college student is interested in investigating the TV-watching habits of her classmates and surveys 20 people on the number of hours they watch per week. The results are provided below;

Hours of TV per week (X): 6, 14, 13, 6, 16, 10, 19, 4, 5, 5, 18, 8, 7, 14, 8, 8, 9, 12, 6, 5.

Firstly, the Pivotal quantity for 80% confidence interval for the true average is given by;

P.Q. = $\frac{\bar X-\mu}{\frac{s}{\sqrt{n} } }$ ~ $t_n_-_1$

where, $\bar X$ = sample mean number of hours of TV watched per week = $\frac{\sum X}{n}$ = 9.65

s = sample standard deviation = $\sqrt{\frac{\sum (X -\bar X)^{2} }{n-1} }$ = 4.61

n = sample of people = 20

$\mu$ = true average number of hours of TV watched per week

Here for constructing 80% confidence interval we have used One-sample t-test statistics as we don't know about population standard deviation.

So, 80% confidence interval for the true average, $\mu$ is ;

P(-1.33 < $t_1_9$ < 1.33) = 0.80 {As the critical value of t at 19 degrees of

freedom are -1.33 & 1.33 with P = 10%}

P(-1.33 < $\frac{\bar X-\mu}{\frac{s}{\sqrt{n} } }$ < 1.33) = 0.80

P( $-1.33 \times {\frac{s}{\sqrt{n} } }$ < ${\bar X-\mu}$ < $1.33 \times {\frac{s}{\sqrt{n} } }$ ) = 0.80

P( $\bar X-1.33 \times {\frac{s}{\sqrt{n} } }$ < $\mu$ < $\bar X+1.33 \times {\frac{s}{\sqrt{n} } }$ ) = 0.80

80% confidence interval for $\mu$ = [ $\bar X-1.33 \times {\frac{s}{\sqrt{n} } }$ , $\bar X+1.33 \times {\frac{s}{\sqrt{n} } }$ ]

= [ $9.65-1.33 \times {\frac{4.61}{\sqrt{20} } }$ , $9.65+1.33 \times {\frac{4.61}{\sqrt{20} } }$ ]

= [8.28 hours, 11.02 hours]

Therefore, 80% confidence interval of the true average number of hours of TV watched per week is [8.28 hours, 11.02 hours].

7 0

2 years ago

Mr Rodríguez drove 136 miles to main city .then he drove another 146 miles to rock town. How many miles did mr Rodríguez drive ?

dmitriy555 [2]

Answer:

he drove 282 miles

Step-by-step explanation:

you add 136 and 146 to get 282

3 0

2 years ago

Read 2 more answers

Find the volume of a square oblique pyramid whose base measures five feet per side, with a vertical height of 18 feet. A. 225 ft

Oxana [17]

Answer:

B. 150 ft³

Step-by-step explanation:

The general formula for the volume of a pyramid is:

V = $\frac{1}{3}Bh$ where B = the area of the base and h = height of the pyramid

Since the base of the pyramid is a square, we can take the length of the side squared:

A = s²

A = 5² = 25 ft²

Using B = 25 and h = 18:

V = $\frac{1}{3}*25*18=150ft^{3}$

3 0

2 years ago

Read 2 more answers