Answer:
7
Step-by-step explanation:
Remove parentheses.

Add −8 and 4.5.

Subtract 8.25 from 6.25.

Multiply 4 by −3.5.

Divide −14 by −2.
= 7
Answer:
answers attached
Step-by-step explanation:
10 students averaged 80, so the sum of their scores was (10 x 80) = 800
20 students averaged 89, so the sum of their scores was (20 x 89) = 1,780
All together, the sum of all 30 scores was (800 + 1,780) = 2,580
30 students totaled 2,580, so their average was (2,580 / 30) = <em> 86</em> .
C=25x+75 would be the equation
Step-by-step explanation:
75 dollars is the flat out fee right away and the 25 is for how many hours spent fixing the drain