Plans for a new school call for classrooms directly across the hall from each other to be congruent. This computer printout shows a math classroom.

a

step-by-step explanation:

sounds & other waves originate from any vibrating object

yes

step-by-step explanation:

so of course you want to start by plugging the 5 in which goes to 7(5)+3(5)=50 because 7*5=35 and 3*5=15 and then add them together, then plug in the 5 to the other equation as well 9(5)+5=50 because 9*5= 45 and then add 5 and so yes they are equivalent.