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?

1 Answer
Feb 8, 2016

Answer:

#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.