Suppose a, b,c and d are positive real numbers that satisfy the system of equations (a+b) (c+d)=143
(a+c) (b+d)=150
(a+d) (b+c)=169
Compute the smallest possible value of a²+b²+c²+d²

If eh = hg and hg=16, find the diameter of k

Data are collected to see how many ice-cream cones are sold at a ballpark in a week. day 1 is sunday and day 7 is the following saturday. use the data from the table to create a scatter plot.

This is about circle theorems. someone asap : (