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xxTIMURxx [149]
3 years ago
7

Factorise completely 4y^2-z^2

Mathematics
1 answer:
svlad2 [7]3 years ago
5 0
S the difference of 2 squares:-

a^2 - b^2 = (a + b)(a - b)

so her it is (2y + z)(2y - z)
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If D=20 miles when T=15 minutes, write a proportion to find D for T=20 minutes
Igoryamba
D/20=20/15

d=400/15

d=80/3

d=26 2/3 miles
8 0
2 years ago
In 2000, an invasive plant species covered 0.2% of an island. for the 5 years that followed, the area covered by the plant tripl
Elden [556K]

Answer:

The statement is correct

see the explanation

Step-by-step explanation:

we know that

The equation of a exponential growth function is equal to

y=a(1+r)^x

where

y  is the area covered by the plant in percentage

x is the time in years since 2000

r is the rate of change

a is the initial value

In this problem we have

r=200\%=200/100=2

a=0.2\%

substitute the values

y=0.2(1+2)^x

y=0.2(3)^x

In the year 2005

x=2005-2000=5\ years

substitute the value of x in the exponential function

y=0.2(3)^5=48.6\%

48.6% is about 50%

therefore

The statement is correct

5 0
3 years ago
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kifflom [539]

Answer:

A.130 stamps after 3 months

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7 0
2 years ago
if something is on sale for 35% off the original price and the sale price is 2.73, what is the original price?
Troyanec [42]
$4.20, 2.73/65 >>> .042 x 100 >>> answer.

Bonus:
To check it you'd do 4.20/20, then multiply .21 by 13 (65% divided into 5% portions = 13 portions) and your answer will be $2.73.
5 0
3 years ago
Read 2 more answers
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Census data, that is, <span>the final report as published by the census bureau is an example of public information. The census gives quantitative information about the population. It typically includes accounting for the sex, age, and occupation of the population it includes in the survey. It is public information because data collected and organized are made available to the public either through publication or online platforms. </span>
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2 years ago
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