First find the percent of the sales tax added with the tip amount, which is 20%
15% + 5% = 20%
and the percent amount to the original amount, so
20% + 100% = 120%
$18=120% of original amount (12/10 is the same thing as 120%), so
18/12*10=$15= price of meal before tax and tip!
Answer:
x=8 and is not extraneous
Step-by-step explanation:
2(x-5)+11=17
2x-10+11=17
2x+1=17
2x=17-1
2x=16
x=8
extraneous means it is a solution, but it is not possible in the equation, to determine if it is extraneous, plug it in to the original equation
2(8-5)+11=17
2(3)+11=17
6+11=17
17=17
since it works in the orignial equation it is not extraneous
Answer:
f(-3) = -7
Step-by-step explanation:
Given:
f(x) = 4x + 5
x = -3
Plug in -3 for x in the equation:
f(-3) = 4(-3) + 5
Remember to follow PEMDAS. First multiply, then add:
f(-3) = 4(-3) + 5
f(-3) = -12 + 5
f(-3) = -7
f(-3) = -7 is your answer.
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Answer:
Step 4 : he should have divided both sides by negative seven
Step-by-step explanation:
