Answer:
-5x
Step-by-step explanation:
Remember, if you multiply a negative number by a negative number, you will get a positive number, and positive numbers are greater than negative numbers. In this case, if I were to multiply each of these expressions with -1, I would get the following:
7(-1)+4=-3
-1-4=-5
5(-1)=-5
-5(-1)=5
And I'm sure you can imply how these values will correspond to other negative values. Basically, the last expression gives us a positive answer, which is larger than the others (which give a negative answer).
Let's say the test is 100 points.
The 70% mean means that the mean for the 30 students was 70 points. That means 2100 points were scored between all 30 students. (70·30=2100)
20 boys had a mean of 62% or 62 points for our test. That means the boys earned 62·20 points, or 1240 points.
That then means the girls earned 2100 - 1240 points, or 860 points.
Since there are 10 girls, 860/10 = 86 or 86% mean on the test.
Girls rock!
Answer:
1. -1/2 1/2 1/4
2. -3.5 -3.6 -3.7
3. -1/10 -1/11 -1/12
hope this helps
have a good day :)
Step-by-step explanation:
Answer: second choice!
Step-by-step explanation:
Find the intersection point between the 2 restraint equations:
30 - 2x = 12 - \frac{1}{2} x \\ \frac{3}{2} x = 18 \\ x = 12
Substitute back in to find y-value:
y = 30 - 2(12) = 6
P is maximized at point (12,6)
P = 9(12)+9(6) = 162
