70 POINTS I need help please!

Given: WY = XZ
Prove: WX = YZ

Substitution property
subtraction property
definition of congruence
transitive property
segment addition postulate

An appliance store sells a washer-dryer combination for $1800. if the washer costs $300 more than the dryer, find the cost for each appliance.

Using the side-splitter theorem, daniel wrote a proportion for the segment formed by luke segment de. what is ec?

Some boys and girls were asked if they had a pet. one third of the group were boys. there were 20 boys. 20% of the girls had a pet. boys with a pet : girls with a pet = 1 : 5 i need to know how many girls there are.