Find the value of the derivative (if it exists) at each indicated extremum. (If an answer does not exist, enter DNE.)

f (x) = cosπx/2

If 5 (x+1) - 6 (x-3) + 2 (2x+1) = 28, then what is x?

Half of n is equal to 48 in algebraic expression

The population of at a town has grown 2% each year. In 1998, the population of the town was about 10,000 people. What was the population in 1999?

The perimeter of a rectangle is 144 ft. The ratio of the width to the length is 3:5. Find the dimensions (length and width) of the rectangle.

3. Order the rational numbers from least to greatest: 0.5, 0, - 1.5, 1, - 0.5, - 1

In 2005, there were 18,400 students at college A, with a projected enrollment increase of 500 students per year In the same year, there were 37,650 students at college B, with a projected enrollment dec line of 1250 students per year According to

Suppose that 1% of the students in a school have head lice and the test for head lice is accurate 75% of the time. What is the probability that a student in the school has head lice, given that the test came back positive?,

What is the angle rotational symmetry when the order is 20? A. 10 B. 360 C. 18 D. 90

What is the common denominator of 5/x2-4,-2/x+2

Find the least common multiple of 2,9, and 12.