The pH in a reactor varies sinusoidally over the course of a day. The period is 24 hours. Time, hr 0 2 4 5 7 9 12 15 20 22 24 pH 7.6 7 7.1 6.5 7.4 7.2 8.9 8.8 8.9 7.9 7 Problem 19.003.a Find best fit with least-squares regression Identify the best fit for the given data using least-squares regression

If n stands for number sold and c stands for cost per item, in which column would you use the formula: ? a. column d c. column f b. column e d. column g

If the value of cos330°is√3/2 then find cos 165°.

Use the following statements to write a compound statement for the conjunction or disjunction. then find its truth value. p: an isosceles triangle has two congruent sides. q: a right angle measures 90° r: four points are always coplanar. s: a decagon has 12 sides. a) a right angle measures 90° or an isosceles triangle has two congruent sides; true. b) a right angle measures 90° and an isosceles triangle has two congruent sides; true. c) a right angle measures 90° and an isosceles triangle does not have two congruent sides; false. d) a right angle measures 90° or an isosceles triangle does not have two congruent sides; true.