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Alika [10]
3 years ago
13

How do I work out -5(-8)

Mathematics
2 answers:
slava [35]3 years ago
5 0
You have to simplify like this (-5)(-8)=40
arlik [135]3 years ago
4 0
When you have 2 negatives, it eaquals a positive so you can just take off both of the negatives and multiply 5 and 8, ,or, (-5)(-8)
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The diameter of a circle is 10 m. Find its area to the nearest tenth.
Readme [11.4K]

Answer:

78.54 m^2

Step-by-step explanation:

The computation of the area of the circle is shown below:

As we know that

Area of the circle = πr^2

Also

Diameter = 2r

10 = 2r

r = 5

So, the area of the circle is

=  3.14 × 5^2

= 78.54 m^2

8 0
3 years ago
theresa worked 9 hours on monday and 7 hours on wednesday.. her total pay was 156.00. what is her rate per hour
cricket20 [7]
$9.75 per hour is the answer 
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3 0
4 years ago
A large sample of tires from cabs driven within a city have an average tire tread depth of 0.25cm at the end of the winter. If t
frutty [35]

Answer:

0% probability cab tires depths would be shallower than 0.25cm.

Step-by-step explanation:

Problems of normally distributed samples can be solved using the z-score formula.

In a set with mean \mu and standard deviation \sigma, the zscore of a measure X is given by:

Z = \frac{X - \mu}{\sigma}

The Z-score measures how many standard deviations the measure is from the mean. After finding the Z-score, we look at the z-score table and find the p-value associated with this z-score. This p-value is the probability that the value of the measure is smaller than X, that is, the percentile of X. Subtracting 1 by the pvalue, we get the probability that the value of the measure is greater than X.

In this problem, we have that:

\mu = 2.2, \sigma = 0.33

What is the probability cab tires depths would be shallower than 0.25cm.

This probability is the pvalue of Z when X = 0.25. So

Z = \frac{X - \mu}{\sigma}

Z = \frac{0.25 - 2.2}{0.33}

Z = -5.9

Z = -5.9 has a pvalue of 0.

0% probability cab tires depths would be shallower than 0.25cm.

7 0
3 years ago
Find the minimum and maximum possible areas of a rectangle measuring 2 km by 5 km.Find the minimum and maximum possible areas of
jeka57 [31]

<u>Answer:</u>

Minimum possible area = 6.75 km^2

Maximum possible area = 13.75 km^2

<u>Step-by-step explanation:</u>

This question relates to significant figures so assuming that each of the given values is rounded off to the nearest kilometer.

So we can find the minimum and maximum possible areas of the rectangle.

Minimum possible area of rectangle = 1.5 × 4.5 = 6.75 square kilometers

Maximum possible area of rectangle = 2.5 × 5.5 = 13.75 square kilometers

7 0
3 years ago
The cost of a pair of jeans was changed from $47 to $42.13. what was the percent change?l
My name is Ann [436]

Answer:

10.4%

Step-by-step explanation:

\$47 \:to \:  \$42.13\\\\47 - 42.13\\\\= \$4.87\\\\= \frac{4.87}{47}  \times 100\\\\\frac{487}{47} \\\\=10.36 \\= 10.4 \%

6 0
3 years ago
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