Solve for a.
a+c=r−d
options:
a) a=r−d−c
b) a=r+d−c
c) a=d+r+c
d) a=c+r−d

What situation is an example of an observational study

If t8 = 4 and t12 = −2, find the first three terms of the arithmetic sequence.

Neal buys a board game. he pays for the board game and pays $1.54 in sales tax. the sales tax rate is 5.5%. what is the original price of the board game, before tax