Use sigma notation to represent the sum of the first six terms of the following sequence: 4, 12, 20,
a] 6 over ∑ (n = 1) -4 + 8n
b] 6 over ∑ (n = 1) 4 + 8n (i think it is "b",
c] 6 over ∑ (n = 1) -1 + 8n
d] 6 over ∑ (n = 1) 1 + 8n

The surface area (sa) of a cube with a as the length of each of its sides is given by the formula . if the surface area is known, how can you rewrite the formula to find its side?

If two angles of a triangle have equal measures and the third angle measures 90°, what are the angle measures of the triangle? a. 60°, 60°, 60° b. 45°, 90°, 90° c. 30°, 30°, 90° d. 45°, 45°, 90°

For a science project, a high school research team conducted a survey of local air temperatures. based on the results of the survey, the found that the average temperatures were around 10 degrees higher than expected. this result was wrong. the trouble with the survey was that most of the locations were exposed to direct sunlight and located over asphalt or sand, which resulted in higher temperatures than normal. this is a classic example of an error in which phase of inferential statistics?