An air-conditioning company counted 56 invoices at the end of the month. They charge $450 for a new installation and $75 for a service call. The total dollar amount of the invoices was $9,450.

How many installations and service calls did the company perform?

i will pick c put check it over to be sure

step-by-step explanation:

the diagram shows you   triangle def with de=4, df=9 and de≠df≠ef.

the sum of the lengths of two triangles' sides are always greater than the length of the third side:

substitute sides lengths:

then 5< ef< 13 (option 3 is true).

def is a scalene triangle with all sides of different lengths (option 5 is true, option 2 is false).

answer: correct choices are 1, 3 and 5

answer is b chief get it right