Explain a method of estimating an answer to addition and subtraction problems involving mixed
numbers. Could your estimated answer vary from the
exact answer? If it did, what would the estimation
accomplish?

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:

step-by-step explanation:

given perimeter: 28cm

length: 9cm

atp,

2(l+w)=p of the reactangle

2(9+x)=28

18+2x=28

2x=28-18

x=10/2

x=5

therefore width is 5 cm

a; x = 0.5

step-by-step explanation:

-10x = -5

x = 0.5

a) 7x=7

step-by-step explanation: