Subtract. −1 3/5−(−2 7/8)

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1.275 or 1 11/40

1 11/40

Step-by-step explanation:

-1 3/5- (-2 7/8)

so the negative and subtraction combined to positive

like,

-1 3/5+ 2 7/8

so, then separate to make it easier,

-1 -3/5 +2 +7/8

then,

-1+2= 1

and,

-3/5+7/8 but you have to find common denominators so,

-24/40 + 35/40 = 11/40

after that add it all together to get your answer,

1 + 11/40= 1 11/40

for ex: the reciprocal of 3/4 is 4/3. it is the opposite.

reciprocal definition:

a mathematical expression or function so related to another that their product is one; the quantity obtained by dividing the number one by a given quantity.

it's equivalent, so we can say that its equal.

let's call the denominator x and the numerador is 18 less then denominator, x - 18.

multiply

2.x = 5.(x - 18)

2x = 5x - 90

90 = 5x - 2x

90 = 3x

x = 90/3

x = 30

so: