The function f(x) = 0.11x + 43 relates how much Derek pays for phone service, f(x), to the number of minutes, x, used for intern
ational calls in a month. What is the value and meaning of f(320)? A:$78.20; this is the amount Derek pays for 320 months of service.
B:$78.20; this is the amount Derek pays for 320 minutes of international calls.
C: $92.50; this is the amount Derek pays for 320 months of service.
D:$92.50; this is the amount Derek pays for 320 minutes of international calls.
The answer is B. <span>$78.20; this is the amount Derek pays for 320 minutes of international calls.
Simply substitute in 320 wherever there is an x and solve. The problem also already told us that x stands for minutes so we know it is 320 minutes.</span>
To form a linear pair means that when added, they equal 180 degrees. but if they have equal measures....180/2 = 90...then they would both equal 90 degrees.....and 90 degrees is a right angle. So ABC and CBD are both right angles
