Answer:d
Step-by-step explanation:
L - Lane's age
m- Mel's age.
Lane is 10 times Mel's age, so 10m = l
difference in their age is 27 so l - m = 27
Substitute l = 10m and you'll have:
10m - m = 27
9m = 27 /:9
m=3
And l = 10m = 10*3 = 30
So Lane has 3 years old and Mel has 30 years old.
Answer: $22
Step-by-step explanation:
First we calculate for the sale price.
We have to find how much is 60% of 50.
We do this by:

This equals 30.
We now subtract the 30 from the 50 to get our sale price.

The sale price is $20.
Now we have to add a 10% sales tax. This is done by multiply the percentage and adding 1 to it like this.

This equals 1.1
This is what we will multiply the $20 by.

The total cost is $22.
Answer:
42%
first we find the totals of each gender which was indicated that there are 29 girls in total ...making it 71 boys there to make100 students .
then it is shown that 9 girls like biology and boys ...anon
20 boys prefer physics and out of the 29 students who like chemistry ..18 are boys which now gives us 38 boys out of 71 .
to get the boys who like biology u subtract 38 from their total which is 71 to get 33.
33 + 9 = 42
42/100 = 42%
This is done through the use of the unit circle.
Your first step is to convert the angle 11π / 2 to an angle between 0 and 2π, which is the range of angles on the unit circle.
This can be done by splitting the circle into sections of π / 2 and counting up 11 sections, or by simply recognizing the fact that 12π / 2 is the same as 6π, which is also the same as 2π. Therefore, we can conclude that 11π / 2 (π / 2 less) is the same angle as 3π / 2.
So we are really finding sin (3π / 2), which is -1 (the y-value of the coordinate at the angle 3π / 2).