Sara is 33 years younger than rolando. the sum of their ages is 105. select the system of equations if sara's age is represented by s and rolando's age is represented by r.

a. s+r=33
s=r-105

b. s+r=105
r=s-33

c. s+r=105
s=r-105

d. s+r=105
s=r-33

e. none of these

Ametal rod needs to be 9 feet and 5.5 inches in length. the sections of the poles being used are each 1 foot and 10.5 inches long. how many 1ft 10.5in sections would be needed to complete the 9ft 5.5in metal rod? and how many inches of material will be left?

Now 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.

What is the value of f(x) = 2.2 for f(-2)?