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help me solve question 8 and 9
Date Posted: 6 years ago
Views: 421
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done
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Hope that it helps
Date Posted:
6 years ago
I don't really understand
Which part did you not understand?
As we don’t know their age, hence we use x and y as a representation of their age.
Given that Joshua is 8 years younger than Elhenne, hence the age of elhenne ,y, substract Joshua’s age ,x, will give you 8.
Furthermore, the question say that after 4 years, the sum of their age will be 50.
So, x + 4 + y + 4 = 50.
Now we can solve the algebra and hence get x (Joshua’s age) = 17 and elhenne’s age = 17 +8 = 25 years old
As we don’t know their age, hence we use x and y as a representation of their age.
Given that Joshua is 8 years younger than Elhenne, hence the age of elhenne ,y, substract Joshua’s age ,x, will give you 8.
Furthermore, the question say that after 4 years, the sum of their age will be 50.
So, x + 4 + y + 4 = 50.
Now we can solve the algebra and hence get x (Joshua’s age) = 17 and elhenne’s age = 17 +8 = 25 years old
done
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Question 9
Date Posted:
6 years ago
question 9a why must it be 10 to the power of 3?
1 km = 1000 cm = 1 * 10^3 cm
We will need to make the units the same before further calculation.
We will need to make the units the same before further calculation.
(25000)^2 = 6.25 * 10^8
9b they want the. answer to be in km
Oops my bad. Sorry missed that section.
2.5* 10^10 cm = 25 000 km^2
1cm^2 = (1000)^2 km^2 = 1.0*10^6 km^2
2.5* 10^10 cm = 25 000 km^2
1cm^2 = (1000)^2 km^2 = 1.0*10^6 km^2
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