Combine like terms in the following expressions.
a. 10x-4x
b.-15n+3n
c. 7.5y+1.6y-2
d. m+4-2m

Figure lmno is located at l (1, 1), m (4, 4), n (7, 1), and o (4, −2). use coordinate geometry to best classify quadrilateral lmno.

Select all the correct answers. what is 221,000,000,000,000,000,000 expressed in scientific notation?

2people are trying different phones to see which one has the better talk time. chatlong has an average of 18 hours with a standard deviation of 2 hours and talk-a-lot has an average of 20 hours with a standard deviation of 3. the two people who tested their phones both got 20 hours of use on their phones. for the z-scores i got 1 for the chatlong company and 0 for talk-a-lot. what is the percentile for each z-score?