A)
A negative times a negative should be positive.
-1*(-a) should be a, not -a
Answer:
$21
Step-by-step explanation:
She bought the book for $15.
15 x 40% = 6
Since she rised the price just add 6 to 15
Hope it was helpful ^^ <3
Good Luck
To define a perpendicular rays, we first define a ray.
A ray starts from one point and extend it to form one direction.
If two lines or rays or line segments intersect at right angle (90°), then they are perpendicular.
In particular, Perpendicular rays are rays that intersect to form a right angle.
Four right angles are formed in the perpendicular rays.
If one is 18 millimeters all you have to do is multiply 18 by 34 to see how long it really is (18x34=612 millimeters)