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Basile [38]
3 years ago
5

I need these done right

Mathematics
1 answer:
Aleks04 [339]3 years ago
7 0

Answer:

13. 20 + (-15) = 5 -- in total he kept 5 pounds

14. -28 + 38 = 10 -- the temperature changed by 10º over 12 hours

15. 100 + (-72) + 48 = 76

Step-by-step explanation:

13. since he gained 20lbs, then lost 15, add -15 to 20 to get 5, the amount of pounds he kept on him

14. the temperature starts at -28º then goes up 38º, so add 38 to -28.

15. the ramp goes up 100, (+100) then down 72, (-72) and then up another 48 (+48) as equation this would be 100 + (-72) + 48

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use a system of linear equations with two variables and two equations to solve. a number is 11 more than another number. twice t
Eva8 [605]

The value of required two numbers x and y are 7 and -4 respectively. These values are find out using Elimination method.

Let the required first number and second numbers be x and y respectively .

We have given that, one Number is more than other by 11

i.e., the difference of two numbers is equal to 11

x - y = 11. …..(1)

And twice the sum of the two numbers is 6 i.e.,

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Now , equation (1) and (2) are linear equation with two variables x and y .

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Added the equation ( 1) and (2) we get, 2x = 14 => x = 7

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Thus, we get the values of two variables x and y is 7 and -4 respectively.

To learn more about linear equation, refer:

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2) 2 because 24% of 100 is 24 and 22% is 22 so 24-22=2

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