Doctors have two methods of calculating maximum heart rate.
with the first method, maximum heart rate, y, in beats per minute
sy= 220 - x, where x is the person's age. maximum heart rate
with the second method is shown in the table. (example 1)
age, x
20 | 30 40 50 60
heart rate (bpm), y 194 187 180 173 1 66
2. are heart rate and age proportional or nonproportional for each method?

On the first of each month, shelly runs a 5k race. she keeps track of her times to track her progress. her time in minutes is recorded in the table: jan 40.55 july 35.38 feb 41.51 aug 37.48 mar 42.01 sept 40.87 apr 38.76 oct 48.32 may 36.32 nov 41.59 june 34.28 dec 42.71 determine the difference between the mean of the data, including the outlier and excluding the outlier. round to the hundredths place. 39.98 39.22 0.76 1.21

Given f(x)=2x^2-8x+6 and g(x)=3x-1 find f(x) +g(x) a. 2x^2+5x+5 b.2x^2-11x+7 c. 2x^2-5x+5 d.2x^2-5x-5

:24% of students in a class are girls. if there are less than 30 students in this class, how many students are there? how many girls are there?