Average means add all scores and divide by number of scores earned
last score is x
so the sum is 75+81+x
3 scores so (75+81+x)/3=average
must be no less than (greater than or equal to 80)
(75+81+x)/3≥80
solve
times both sides by 3 to clear fraction
75+81+x≥240
156+x≥240
minus 156 from both sides
x≥84
the studen must earn at least 84 on last exam
3x + 1 is the answer. Hope this helps you!
Answer:
4
Step-by-step explanation:
Answer:
x=−12
Explanation:
x−(−5)=−7
Step 1: Simplify both sides of the equation.
x+5=−7
Step 2: Subtract 5 from both sides.
x+5−5=−7−5
x=−12
Answer:
All real values
Step-by-step explanation:
Given
![f(x) = (\frac{1}{3})^x](https://tex.z-dn.net/?f=f%28x%29%20%3D%20%28%5Cfrac%7B1%7D%7B3%7D%29%5Ex)
Required
Determine the domain
The domain of a function are the values of x that makes the function to be defined.
From the given function, we can see that no single value of x will make the function become undefined.
Hence, the domain is:
x = (-∞, +∞)
In other words, the domain implies that all real numbers.
Hence:
Option (A) answers the question.