Step-by-step explanation:
since all angles add up to 180:
(8x-1)+(3x+4)+(3x+9)=180
add like terms:
14x+12=180
x=12
Hope that helps :)
Answer:
you would multiply the 78.80 by .20 to the the tip and then multiply the same number by .06 add that to your total and you would get about $96.77
R- All Real numbers
E- I think it means infinity or an equivalent to an = sign
Problem 4:
4a = -15
4b = -75
4c = 125
Problem 5:
5a = -5
5b = 95
5c = -19 
Step-by-step explanation:
<em> See attached for my work. </em>
For problem 4, we substitute the different values given for x and solve.
For problem 5, we set the function equal to the given values and solve.
Answer:
23
Step-by-step explanation: