1. 
13
16
-0.5
False
True


2.
picnic and lemonade like ants
ants and ants like y
lemonadey and antspicnic like antsy
lemonade and sunny like today


3.
7 5
43 41
9 7
3 -1


4. (5 solutions shown)

def has_midpoint(a, b, c):
	mid = (a + b + c) / 3
 	if a == mid or b == mid or c == mid:
		return True
	else:
		return False


def has_midpoint(a, b, c):
	mid = (a + b + c) / 3
	return a == mid or b == mid or c == mid


def has_midpoint(a, b, c):
	return a == (b + c) / 2 or b == (a + c) / 2 or c == (a + b) / 2


def has_midpoint(a, b, c):
	max = max(a, max(b, c))
	min = min(a, min(b, c))
	mid = (max + min) / 2
	return a == mid or b == mid or c == mid


def has_midpoint(a, b, c):
	return a - b == b - c or b - a == a - c or a - c == c - b 


5.
def balance_checkbook():
    balance = float(input("initial balance? "))
    count = int(input("how many transactions? "))
    min = balance
    for i in range(count): 
        amount = float(input(str(i) + "/" + str(count) + " amount? "))
        balance = balance + amount
        print("new balance = $" + str(balance))
        if balance < min:
            min = balance
    print("minimum balance = $" + str(min))
    return (min < 0)


6.
def rand_square(size):
    count = 0
    for i in range(size): 
        backslashes = random.randint(0, size)
        count += backslashes
        print("\\" * backslashes, end="")
        print("/" * (size - backslashes))
    return count