Maria has 39 books in her library she bought several books at a yard sale over the weekend she now has 70 books in her library how many books did she buy at the yard sale

So 39 books and it must equal 70. So 39 + ___ = 70 or, to make it a bit simpler, 70 - 39 = ___. You should be able to do that.

This question could be answered by subtracting 70 - 39. 70 - 39 = 31. Therefore your answer will be 31

The relations ship of the circle and triangle is that a ngles and points on the circumference of a circle are the same thing. a point on the unit circle is the same as a right triangle formed by a radius to the point and its perpendicular to the x-axis. hence sines and cosines which come from ratios of legs of a right triangle to the length of the hypotenuse are also the coordinates of the point on a circle of radius one. i hope this would you.