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Dafna1 [17]
3 years ago
7

Lake Chad in Africa had a surface area of about 10,000 square miles in 1963. Because of climate changes and increased water usag

e by humans, the surface area decreases to about 850 square miles in 2001. By what percent did the surface area change from 1963 to 2001?
Mathematics
1 answer:
9966 [12]3 years ago
8 0

Answer:

Answer is 91.5%

Step-by-step explanation:

In 1963= 10,000 sq miles; In 2001= 850 sq miles

  • Now applying formula of percentage of decrease we get:

% = Decrease in Amount/ Actual Amount

  • Applying values in formula:

= 10000-850/10000

= 9150/10000

% = 0.915

In percentage we get 91.5%

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90 men and 60 women were asked if they had watched the latest 'Expendables' movie.
Stolb23 [73]

Answer:

63 men said no.

Step-by-step explanation

3/5 * 2/2 = 6/10, 6/10 - 3/10 (women) = 3/10 meaning 7/10 men said no. 90*1.7 = 153, 153-90=63

5 0
3 years ago
Read 2 more answers
(25 points) Which list contains only rational numbers?
Shkiper50 [21]
A rational number is any number that can be wrote as a fraction (p/q). A rational number is the quotient or fraction of two integers. It is seen as a ratio of two integers as well. Repeating/terminating decimals are also rational numbers as they can be shown as the ratio of two integers. (p/q) the fraction, will have both the numerator and denominator being whole numbers.

what we can do: Look at each number in the sequences and see which will have only rational numbers. A: 0 is rational, 1/2 is rational because it is a ratio of two integers, 1.5 is rational because it can be written as 3/2, and 2.82843 is rational because it can be wrote over one as a ratio of two integers.

So A is the only list that contains only rational numbers.
8 0
3 years ago
What does 0.47 million mean
Alex777 [14]

Answer:

b

Step-by-step explanation:

3 0
3 years ago
A pyramid has a square base with an area of 169ft. What is the perimeter of the base of the pyramid?
ArbitrLikvidat [17]

Answer:52 ft.

Step-by-step explanation: If the area of the base of the pyramid is

169

ft

2

then each side of the base is

13

ft

long because the base of the pyramid is a square.

Length of the side,

s

=

√

169

=

13

Iif we take the area of a square

A

=

s

2

where

s

=

13

we get the area of the base to be

169

ft

2

thus proving that each side of the base is

13

ft

long.

So to find the perimeter of the base of the pyramid we use the formula:

P

=

4

s

where

s

=

13

ft

and thus,

p

=

4

⋅

13

ft

=

52

ft

7 0
3 years ago
Which angle pairs are supplementary? Check all that<br> apply.
Basile [38]

Answer:

The correct answers are B, C, and E.

B. < 4 and < 3

C. < 4 and < 5

E. < 3 and < 6

Step-by-step explanation:

The pairs in options B, C, and E add up to 180°, which is the definition of a supplementary angle.

Hope this helps!

8 0
3 years ago
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