The measures of the angles of △abc are given by the expressions in the table.
angle measure
a (12x + 12)°
b 15°
c (3x + 18)°

what are the measures of angles a and c?

enter your answers in the boxes.

m∠a=

m∠c=

Solve the equation -9p - 17 =10 a -3 b. 16 c. 18 d -16

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.

Gabriel determined that his total cost would be represented by 2.5x + 2y – 2. his sister states that the expression should be x + x + 0.5x + y + y – 2. who is correct? explain.