i donk know Step-by-step explanation:
Answer:
5 1/4
Step-by-step explanation:
Subtracting a negative is the same as adding a positive.
2 3/8 - (-2 7/8) =
= 2 3/8 + 2 7/8
= 4 10/8
= 4 + 8/8 + 2/8
= 4 + 1 + 1/4
= 5 1/4
3)The original rational number was 17/12.
4)The age of Ruby and Reshma are 20 and 28 years respectively.
Explanation:
3)Let the numerator be x.
So denominator will be (x - 5)
If we add 5 to numberator then it will be (x + 5)
New number is (x + 5)/(x - 5)=11/6
Solve for X by cross multiplying
6(x + 5)=11(x - 5)
6x + 30=11x - 55
5x=85
x=17
So original rational number was 17/12.
4)The ages of Ruby and Reshma are in the ratio 5:7
So, let the present ages of Ruby and Reshma be 5x and 7x respectively.
Also, it is given that four years from now the ratio of their ages will be 3:4
So, the equation - 5x + 4 / 7x + 3 = 3/4
⇒4(5x+4)=3(7x+4)
⇒20x+16=21x+12
⇒21x−20x=16−12
⇒x=4
⇒5x=20 and 7x=28
The age of Ruby and Reshma are 20 and 28 years respectively.
first you divide the amount of miles chris walked with 1/4 or .25 miles then you will get the answer