For each polynomial operation, write the letter that corresponds to the resulting expression from the list.

(5x2 + 2x + 1) + (6x2 − 3x + 9) is equivalent to expression
.

(-3x2 + 6x − 12) + (5x + 9) is equivalent to expression
.

(8x + 16) − (3x2 − 3x − 15) is equivalent to expression
.

(5x2 + 23x − 7) − (x2 − 4x + 21) is equivalent to expression

Someone answer asap for ! max recorded the heights of 500 male humans. he found that the heights were normally distributed around a mean of 177 centimeters. which statements about max’s data must be true? a. the median of max’s data is 250 b. more than half of the data points max recorded were 177 centimeters. c. a data point chosen at random is as likely to be above the mean as it is to be below the mean. d. every height within three standard deviations of the mean is equally likely to be chosen if a data point is selected at random.

Plz ( true - false) all triangles have interior angles whose measure sum to 90.

Acontainer holds 0.7 liters of oil and vinegar. 3/4 of the mixture is vinegar. how many liters of oil are in the container? express your answer as both a fraction and a decimal.