You add 5+7 so the total ratio is 12. then divide 48/12=4. you then multiply the given ration 5:7 by 4=20:28. 20 + 28 is 48 students which is given. so there are 28 girls and 20 boys which means there are 8 more girls than boys.
The last choice would be the best because peak is high, and in the histogram, it means it is the highest point in the histogram and data. Hope ths helped!
the formula for the circumference of a circle is 2 times pi times the radius of the circle. so to find out the radius you divide the circumference by 2 and then by pi.