Question

How do you define a variable and write an expression for each phrase: the sum of one-half of a number and three fourths of the number?

Answer 1

`1/2n+3/4n`

Explanation:

Definition
Let `n` be a variable representing "a number"

Writing the Expression
"one-half of a number" means we need to multiply the number by `1/2`
`color(white)("XXX")1/2xxn`

"three fourths of a number" means we have to multiply the number by `3/4`
`color(white)("XXX")3/4xxn`

"the sum of " something "and" something-else means that we have to add the two thing together
`color(white)("XXX")=(1/2xxn)+(3/4xxn)`

Note that the multiplication symbol (`xx`) is typically omitted and simply assumed by default.