3. (5 points) A company wishes to estimate the mean monthly electric bill. If the standard
deviation is $400, how large a sample is required to estimate the mean electric bill to within $100
with 98% confidence?

How many real and imaginary solutions does the equation x^2-3x=-2x-7 have?

Order the measurements from the least to the greatest. 2,720 ml , 24.91 l , 0.0268 kl

Look at the hyperbola graphed below. the hyperbola gets very close to the red lines on the graph, but it never touches them. which term describes each of the red lines? o o o o a. asymptote b. directrix c. focus d. axis