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3 years ago

What two factors of -21 add up to -20

Mathematics

1 answer:

yawa3891 [41]3 years ago

5 0

1 and -21. Think about it! 1x-21 = -21
-21+1 = -20

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What is the surface area of the sphere shown below with a radious of 6

Bumek [7]

Surface Area of a Sphere is...

$4\Pi r^2$

Now...

$\begin{gathered} 4\Pi r^2 \\ 4\cdot\text{ }\Pi\cdot6^2 \\ =\text{ 4}\cdot\Pi\cdot36 \\ =\text{ 144}\Pi\text{ square unit} \end{gathered}$

The answer is Option C

4 0

1 year ago

Nicole works 50 hours a week and earns $25 per hour. Her company pays overtime of one and half times for all hours worked over 4

ankoles [38]

Her gross weekly pay would be $1375.

25 * 40 = $1000

time and a half means she would make $37.50 for the 10 hours overtime she works. 10 * 37.5 = 375

375 + 1000 = $1375

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3 years ago

an area of a rectangle city park is 1556 square miles the width of the park is 3/7 miles what is the length in miles of the park

alina1380 [7]

Answer:

457

Step-by-step explanation:

value of 1556

explanion

7 0

2 years ago

A construction company wants to build an auditorium on a trapezium shaped plot measuring 410m2. One of the parallel sides of the

Assoli18 [71]

Answer:

other parallel side is 23m

Step-by-step explanation:

Let's assume other parallel sides as 'x'

One of the parallel sides of the trapezium plot measure 18m

so, y=18

distance between the two parallel sides measure 20m

so, h=20

now, we can use area of trapezium formula

$A=\frac{1}{2}\times h \times (x+y)$

now, we can plug values

$A=\frac{1}{2}\times 20 \times (x+18)$

we can set A=410

and then we can solve for x

$410=\frac{1}{2}\times 20 \times (x+18)$

$10\left(x+18\right)=410$

$x+18=41$

$x=23$

6 0

3 years ago

A group of students wanted to investigate the claim that the average number of text messages sent yesterday by

Likurg_2 [28]

First we need to write the null and alternate hypothesis for this case.

Let x be the average number of text message sent. Then

Null hypothesis: x = 100
Alternate hypothesis: x > 100

The p value is 0.0853

If p value > significance level, then the null hypothesis is not rejected. If p value < significance level, then the null hypothesis is rejected.

If significance level is 10%(0.10), the p value will be less than 0.10 and we reject the null hypothesis and CAN conclude that:
The mean number of text messages sent yesterday was greater than 100.

If significance level is 5%(0.05), the p value will be greater than 0.05 and we cannot reject the null hypothesis and CANNOT conclude that:
The mean number of text messages sent yesterday was greater than 100.

7 0

3 years ago