For which of the following values of t is the function f(t)=t-1/t^2-4 not defined

How many of the 250 grandparents in the population would you expect to prefer online shopping with merchant a? merchant a: 4 merchant b: 6 merchant c: 2 merchant d: 3 other: 5 none: 5 answer choices: a. about 4 b. about 8 c. about 40 d. about 21

What is the absolute value of the complex number -4-sqrt2i

The graph shows the distance kerri drives on a trip. what is kerri's speed . a. 25 b.75 c.60 d.50