Alex has 3 pens in his pencil case. This is 25% of the number of pens that he has How many pens does Alex have altogether?​

12 pens

Step-by-step explanation:

25% basically means 25/100 which is simplified to 1/4. Now if 3 pens are 1/4 of all the pens, then you multiply 3 by 4 to give you 12 pens in all.

Alex has 12 pens altogether !

Step-by-step explanation:

- 25% = 25/100

- 25% × 4 = 100%

- 3 × 4 = 12

the answer is (4,3)

since the rule for r0, 90º is (-y,x) and it was already applied to form the image, all you have to do is reverse the answer using this formula.

for the friend request.

when a figure, such as triangle (xyz) is reflected over the line y = x to create x'y'z' the x-coordinates and y-coordinates of the original image (pre-image) will be reversed for the image. (e.g., (x, y) > (y, x)) this means that the pre-image position of the x- and y-coordinates switch places which in turn provides a mirror like image of the original xyz.  

i notice that when i draw a line segment from x to x', that the points are parallel from each other -- they are exactly across from each other and do not intersect with any other points.  

yes, think i would see the same characteristic if you drew the line segment connecting y with the reflecting line and then y' with the reflecting line because of the essence of reflections. because it is a mirror image, each point was effected the same way which leads me to conclude that they same would apply to y and y'.