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Elena-2011 [213]
3 years ago
5

16-25(b+3) square

Mathematics
1 answer:
Andre45 [30]3 years ago
4 0
Since 16 and 25 are perfect squares you can factor the first part.
4^2-5^2(b+3)^2
=(4-5(b+3))(4+5(b+3))
=(4-5b-15)(4+5b+15)
=(-11-5b)(19+5b)

Which can be expanded if necessary,
= -209+150b-25b^2
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A piece of wire 6 cm long weighs 30 grams. What is the weight of an 8 m length of the same wire?
Feliz [49]

Answer:

4000 gm

Step-by-step explanation:

We can use ratios to solve

Change 8 m to cm

8m * 100cm/1m = 800 cm

6 cm             800 cm

-------------  = ------------

30 grams      x gm

Using cross products

6 * x = 800 * 30

6x = 24000

Divide by 6

6x/6 = 24000/6

x = 4000 gm

5 0
2 years ago
15 men can do a piece of work in 80 days. If 5 more men are added, how long will it take to complete same piece of work?​
tresset_1 [31]

Answer:

Step-by-step explanation:

This is an inverse proportion.

men = k / Time         So first we need to find k

k = men * Time         Substitute values

k = 15*80

k = 1200  Notice the units are man days.

Now what happens if we increase the number of men to 20? What happens to the number of days.

20 = 1200 / time          Multiply both sides by time

20*time = 1200            Now divide by 20

time = 1200/20

Answer: time = 60 days

4 0
1 year ago
I dont know please help and show your work
Phoenix [80]
Area=6x10=60 feet as it is rectangle so all angles are 90° and oppossite sides are equal
4 0
3 years ago
What is the absolute deviation from the mean for the following values
Doss [256]
12, 20, 16, 10, 17, 9, 23, 13
1. add them all up 
=120
divide by the number of numbers
120/8
=15
15 is the MAD
6 0
3 years ago
What type of variable is the number of robberies reported in your city? Continuous attribute quantitative qualitative?
erastova [34]

solution:

Attribute is not type of variable, instead, attributes are the categories of a categorical variable. For example: if variable is gender, attributes are male , female.

The number of robberies is not continuous because it connot take all values in a continuous interaval.

The number of robberies is quantitative because the value is numeric (discrete)

It is not qualitative because it is not nominal.  


4 0
3 years ago
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