Answer:
9
Step-by-step explanation:
72/8=9
Question 33 is A because a open circle means not included whereas a closed circle means included.
Answer:
2) -47, 33, -243, 907, -88
4) C & D
5) 30, 45, 0, -10
6) B
Answer:
Step-by-step explanation:
xy = 300
x + y = 50 Solve for y
y = 50 - x substitute into xy = 300
x(50 - x) = 300 Remove the brackets.
50x - x^2 = 300 Bring the left to the right.
0 = x^2 - 50x + 300
This is a quadratic. It will have 2 solutions.
a=1
b = - 50
c = 300
Put these into the quadratic equation.
It turns out that x has two values -- both plus
x1 = 42.03
x2 = 6.97
x1 + y1 = 50
42.03 + y = 50
y = 50 - 42.03
y = 7,97
(42.03 , 7.97)
====================
x2 + y2 = 50
6.97 + y2 = 50
y2 = 50 - 6.97
y2 = 43.03
(6.97 , 43.03)
B² - 4ac
= 8² - 4*(-2)*(-9)
= 64 - 72
= -8
