∠a and ∠b supplementary and vertical angles. what is m∠b

135

90

180

45

Could someone with number 1 and 2

The product of 3 and a number increased by 8 is 31 written as an equation

Summary statistics given for independent simple random samples from two populations. use the pooled t-interval procedure to obtain specified confidence interval. x1=71.6, s1=3.9, n1=11, x2=67.9, s2=3.4, n2=9 determine a 99% confidence level.