Margie takes a random sample of 30 students in her seventh-grade class and finds that 75% of the sample prefers the color blue over the color red. there are 125 students in the seventh grade. based on the sample proportion, about how many students in the seventh grade would be expected to prefer blue over red?
30
75
94
125

First you turn 75% into a decimal (.75. Then you multiply that by 125 to get about 94. 
The answer would be 94.
To check this you can turn it into a fraction 94/125 then turn it into a fraction which would be 75%

First, think of what you know. you know that the number t the end of the equation will need to be subtracted because it is the money he lost from buying the lawn mower. and your first two weeks have negative profit, so that tells you that c and d are wrong. now you can plug any of the weeks into a and b to see which one works. i'll start with plugging week 1 into a.this isn't right because it says your answer for week one should be -90.so now we need to try the same thing with b.this one got you the right answer, (sometimes if you only check with one of the weeks multiple will work so you need to check with more of the weeks, but it worked out fine here)this means that b is the correct answer.let me know if you need more clarification. i hope this : )

The answer is b. (-13).