Anyone want a free 40 points for no reason?

What is the common difference in the following arithmetic sequence? 7,3,-1,-5

The actual length of side t is 0.045 cm. use the scale drawing to find the actual side length of w. a) 0.06 cm b) 0.075 cm c) 0.45 cm d) 0.75 cm

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