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klio [65]
3 years ago
14

Andrew is half his brother's age. Three years ago, the sum of their ages was 24. How old are they each now? Please answer Fast.

Mathematics
1 answer:
Viktor [21]3 years ago
5 0

Answer:

Andrew 10 and his brother 20 years old

Step-by-step explanation:

three years ago

7 and 17  add up to 24

Hope this helps

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X-2y+z=5 <br>3x+3y-2z=-6 <br>2x-y+3z=11 <br>find x+y+z
BartSMP [9]
      x - 2y + z = 5   | *2
 ⇒ 2x - 4y+ 2z=10
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    2x+3x - 4y+3y+2z-2z=10-6
     5x - y = 4       (1)

    3x + 3y - 2z = - 6   | *3         ⇒ 9x + 9y - 6z = - 18
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x+y+z=3







3 0
3 years ago
Pweaseee help me.❤!!!!!!!!!!!!​
Alex Ar [27]

Answer:

\frac{k}{3}  = 39 \\ k = 117

Good luck!

Intelligent Muslim,

From Uzbekistan.

8 0
3 years ago
Read 2 more answers
(8x+2) by (5x+4) what’s the area
ki77a [65]

Answer:

x=2

Step-by-step explanation:

3 0
3 years ago
A countrys population in 1990 was 145 million. In 1998 it was 151 million. Estimate the population in 2015 using the exponential
alexandr402 [8]

Answer:

The population in 2015 will be 165 million.

Step-by-step explanation:

The exponential growth formula is given by:

f(t) = a(1 + r)^{\Delta t}

Where:

a: is the initial population

r: is the rate of increase

Δt: is the time        

With the initial information we can find the rate:

151 = 145(1 + r)^{1998-1990}      

Using logarithm:                                    

ln(151) = ln(145) + 8[ln(1 + r)]  

ln(1 + r) = \frac{ln(151) - ln(145)}{8}                        

ln(1 + r) = 5.0683 \cdot 10^{-3}          

Using exponential:          

e^{ln(1 + r)} = e^{5.0683 \cdot 10^{-3}}

r = 5.081 \cdot 10^{-3}        

Now, we can find the estimated population in 2015:

f(t) = 151(1 + 5.081 \cdot 10^{-3})^{2015-1998}              

f(t) = 165              

Therefore, the population in 2015 will be 165 million.

I hope it helps you!

5 0
3 years ago
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