Answer:
x=-5
Step-by-step explanation:
-3x+25=40. You want to isolate x so you have to subtract 25 from both sides. -3x=15. We then want x to be isolated so we have to divide both sides by -3 to make x by itself. x=-5. Therefore, x=-5.
If this helps please mark as brainliest
Answer:
0.15866.
Step-by-step explanation:
We have been given that on average, electricians earn approximately μ= $54,000 per year in the united states. Assume that the distribution for electricians' yearly earnings is normally distributed and that the standard deviation is σ= $12,000. We are asked to find the probability that the sample mean is greater than $66,000.
First of all, we will find the z-score corresponding to 66,000 using z-score formula.
Now, we need to find the probability that z-score is greater than 1 that is 
.
Upon using formula 
, we will get:
Upon using normal distribution table, we will get:
Therefore, the probability that the sample mean is greater than $66,000 would be 0.15866 or approximately 
.
Answer:
The answer would simply be m = (8 + 3n)/4
Step-by-step explanation:
If you look at the question closely, you have two variables, and you have not been given the value for any of them, so we have to solve this algebraicly.
First, we need to get m on one side, and so we add 3n to both sides to get rid of it.(We should have 4m = 8 + 3n)
Next, we need to isolate m, we need to get it alone, by itself to get the answer, so we divide by 4 on both sides.
The expression on the right side(8 + 3n) has to be divided by 4 fully, and so your answer would simply be m = (8 + 3n)/4.
If you need more confirmation, plug in the whole expression into the given expression to check your answer.
I'll leave the picture to you; draw a rectangle and write 2x+4 along the length and 4x along the width. We don't really know the aspect ratio of the rectangle until we know x so any rectangle is fine.
The perimeter is the sum of all four side lengths,
p = (2x + 4) + 4x + (2x + 4) + 4x
Answer: p = 12x + 8
Answer:
is it 50 origanally or after the discount
Step-by-step explanation:
