The mean is 100 and the standard deviation is 15. What is the percentile rank for each of the following scores? 1) 130
2) 145
3) 85
4) 70

One of the same side angles of two parallel lines is 20° smaller than the other one. find the measures of these two angles.

If i have one apple and give you the apple, how many apples do i have?

Thales was an ancient philosopher familiar with similar triangles. one story about him says that he found the height of a pyramid by measuring its shadow and his own shadow at the same time. if the person is 5-ft tall, what is the height of the pyramid in the drawing?