Ms. Peterson wrote the expression below on the chalkboard for her class. She asked the students to write an equivalent expression using no more than one set of parentheses.

4(3x+5y+2z)+3(x−z)

• Tom wrote 12x+20y+8z

• Jenna wrote 5(3x+4y+z)

• Chris wrote 15x+20y−5z

Which, if any, of the three students wrote an expression that is equivalent to Ms. Peterson’s expression?

Answer wrote an equivalent expression.

Show your work to prove which expressions, if any, are equivalent.

Find the value of tan theta if sin theta = 12/13 and theta is in quadrant 2

Cot(90° − x) = 1 the value of x that satisfies this equation is °. a. 60 b. 135 c. 225 d. 315

3.17 scores on stats final. below are final exam scores of 20 introductory statistics students. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 57, 66, 69, 71, 72, 73, 74, 77, 78, 78, 79, 79, 81, 81, 82, 83, 83, 88, 89, 94 (a) the mean score is 77.7 points. with a standard deviation of 8.44 points. use this information to determine if the scores approximately follow the 68-95-99.7% rule. (b) do these data appear to follow a normal distribution? explain your reasoning using the graphs provided below.