Answer:
103
Step-by-step explanation:
your friend's score=x
twice your friend's score=2*x
then your score=6+2*x
Given that your score is=212
In other words, 6+2*x=212
2*x=212-6
2*x=206
x=206/3
x=103
Answer:
B. lie on different lines
Step-by-step explanation:
Answer:
x = 10
Step-by-step explanation:
You can try the answers to see which works. (The first one does.)
Or, you can solve for the variable:
Divide by 75
... (1/5)^(x/5) = 3/75 = 1/25
Recognize that 25 = 5^2, so ...
... (1/5)^(x/5) = (1/5)^2
Equating exponents, you have
... x/5 = 2
... x = 10 . . . . . multiply by 5
_____
You can also start by taking logarithms:
... log(75) +(x/5)log(1/5) = log(3)
... (x/5)log(1/5) = log(3) -log(75) = log(3/75) = log(1/25) . . . . simplify the log
... x/5 = log(1/25)/log(1/5) = 2 . . . . . simplify (or evaluate) the log expression
... x = 10 . . . . . multiply by 5
_____
"Equating exponents" is essentially the same as taking logarithms.
The answer is D.
this is unnecessary because i have to have twenty characters<span />
-4.2, -3.5,-2.1,-1.5,-1,-0.5,0.5,2,3.5,4.8
