PLEASE HELP ME!!! B, C and D are points on a circle, centre O.
BOD is a diameter of the circle. AB is the tangent to the circle at B.
AO = 8 cm. Angle BAO = 30° Angle CBD = 63°
Calculate the length of BC. Give your answer correct to 3 significant figures.

Find an equation for the linear function which has slope -10 and x-intercept -7

Factor the expression using gcf 9b+45

Needmax 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.