Please help Find the value of DF given that DE=1.5m−9 and EF=4.5m−42.

The figure shows triangle D E F. All three sides of the triangle are congruent..

answers are one of the following
DF = 7.5
DF = 4.5
DF = 11

answer: there are x+184 pages in olivia's book.

step-by-step explanation:

let the total number of pages in the book which olive has already read be x.

then if olive has 184 pages left to read, then the total number of pages are in olive's book= pages she has read+pages she has left to read

therefore, the total number of pages in olivia's book=

hence, there are x+184 pages in olivia's book.