The relative frequencies for a set of data are shown in the table below. Value Relative Frequency
1 0.15
2 0.10
3 0.45
4 0.30
If there are a total of 20 data values, with what frequency does the data value 3 occur?

Asegment in the complex plane has a midpoint at 7 – 2i. if the segment has an endpoint at 11 – 3i, what is the other endpoint?

If cos(2x) = tan^2(y), show that cos(2y) = tan^2(x).

Titus works at a hotel. part of his job is to keep the complimentary pitcher of water at least half full and always with ice. when he starts his shift, the water level shows 4 gallons, or 128 cups of water. as the shift progresses, he records the level of the water every 10 minutes. after 2 hours, he uses a regression calculator to compute an equation for the decrease in water. his equation is w –0.414t + 129.549, where t is the number of minutes and w is the level of water. according to the equation, after about how many minutes would the water level be less than or equal to 64 cups?