4 years ago

Solve. 5x 5 = 4x 10 x =

Mathematics

1 answer:

Step2247 [10]4 years ago

5 0

5x + 5 = 4x + 10
5x - 4x = 10 - 5
x = 5

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Historically, Australia has 300 indigenous languages. Only 90 are still spoken today. What percent have gone extinct?

shtirl [24]

Answer:

70%

Step-by-step explanation:

well first you have to take put 90 over 300, times 100

90 100 = 30%

300 × 1

That gives you the percentage that is spoken today.

Then you have to take away that answer from 100%

100%

- 30%

70 %

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3 years ago

Find a4 for the arithmetic series with S4=-36 and a1=9

erastova [34]

ANSWER

The 4th term is -27

EXPLANATION

The sum of the first n-terms of an arithmetic sequence is

$S_n= \frac{n}{2} (2a_1+d(n-1))$

It was given that,

$S_4 = - 36$

$a_1 = 9$

$- 36= \frac{ 4}{2} (2 \times 9+d(4-1))$

$-36=2(18+3d)$

$-18=18+3d$

$-18 - 18 = 3d$

$3d = - 36$

$d = - 12$

The n-term is given by:

$a_n=a_1+ (n-1)d$

We substitute n=4 to get,

$a_4=9+ (4-1) \times -12$

$a_4=9+ 3\times -12$

$a_4=9 - 36$

$a_4= - 27$

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3 years ago

24=2*3.14*r What is the value of r?

grigory [225]

R=2.5 maybe
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7 0

4 years ago

Name the property of equation 8 x 1/8=1

tatiyna

Answer:

Inverse property of multiplication

Step-by-step explanation:

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4 years ago

make a scale drawing of a rectangle school hall which is 50m long and 30m wide using a scale of 1cm to 5m. use your scale drawin

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3 years ago

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