All categories

2 years ago

-2 • (-3)3 = ? i really need help, I’m struggling so much in math.

Mathematics

2 answers:

Ronch [10]2 years ago

6 0

Answer:

The answer would be 54

Step-by-step explanation:

nadezda [96]2 years ago

4 0

Let's break this statement into small pieces. Let's start with $(-3)^{3}$ . This means $-3 \times -3 \times -3$ which is equal to $-27$ ( $-3 \times -3 = 9, 9 \times -3 = -27$ ).

Note the following rules

$- \times - = +$
$+ \times + = +$
$- \times + = -$

$+ \times - = -$

Now let's solve the rest of the equation. $-2 \cdot (-3)^{3} = -2 \cdot -27$ (Note $\cdot$ is the same as $\times$ . $= -2 \cdot -27$ , $54$

The answer is $54$

You might be interested in

Help now fast please

Vsevolod [243]

2y64xxy43x686ex4226xe

8 0

3 years ago

Construct a 99% confidence interval for the population mean, mu. Assume the population has a normal distribution. A group of 1

Zarrin [17]

Answer:

99% confidence interval for the population mean is [19.891 , 24.909].

Step-by-step explanation:

We are given that a group of 19 randomly selected students has a mean age of 22.4 years with a standard deviation of 3.8 years.

Assuming the population has a normal distribution.

Firstly, the pivotal quantity for 99% confidence interval for the population mean is given by;

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

where, $\bar X$ = sample mean age of selected students = 22.4 years

s = sample standard deviation = 3.8 years

n = sample of students = 19

$\mu$ = population mean

<em>Here for constructing 99% confidence interval we have used t statistics because we don't know about population standard deviation.</em>

So, 99% confidence interval for the population mean, $\mu$ is ;

P(-2.878 < $t_1_8$ < 2.878) = 0.99 {As the critical value of t at 18 degree of

freedom are -2.878 & 2.878 with P = 0.5%}

P(-2.878 < $\frac{\bar X - \mu}{\frac{s}{\sqrt{n} } }$ < 2.878) = 0.99

P( $-2.878 \times {\frac{s}{\sqrt{n} } }$ < ${\bar X - \mu}$ < $2.878 \times {\frac{s}{\sqrt{n} } }$ ) = 0.99

P( $\bar X -2.878 \times {\frac{s}{\sqrt{n} }$ < $\mu$ < $\bar X +2.878 \times {\frac{s}{\sqrt{n} }$ ) = 0.99

<u>99% confidence interval for</u> $\mu$ = [ $\bar X -2.878 \times {\frac{s}{\sqrt{n} }$ , $\bar X +2.878 \times {\frac{s}{\sqrt{n} }$ ]

= [ $22.4 -2.878 \times {\frac{3.8}{\sqrt{19} }$ , $22.4 +2.878 \times {\frac{3.8}{\sqrt{19} }$ ]

= [19.891 , 24.909]

Therefore, 99% confidence interval for the population mean is [19.891 , 24.909].

6 0

3 years ago

Work out the area of the shaded shape.

Step2247 [10]

Answer:

Step-by-step explanation:

A = 8(14) - 9(8 - 4) = 76 m²

4 0

2 years ago

PLEASE HELP!!!! I HAVE TO SUBMIT THIS IN AND I DONT KNOW!!

masya89 [10]

Answer:

your answer is clearly luke skywalker banana toungue

Step-by-step explanation:

because i felt like it

8 0

3 years ago

Triangle LMN is located at L(2,3), M(1,2), and N(4,4). The triangle is then transformed using the rule (x+5, y+2) to form the im

charle [14.2K]

Using the rule (x+5, y+2) you would add 5 to the x value and 2 to the y value so the answer would be L' (7,5) M' (6,4) N' (9,6)

8 0

3 years ago