Answer:
E) 70
Step-by-step explanation:
Using combination factorial
a triangle has three vertices and a quadrilateral has 4 vertices
The number of triangles and quadrilaterals = ⁷C₃ + ⁷C₄ =
= 70
Let "x" be the scaling factor
3x mums
2x dads
mums appt. + dads appt = total appointments
3x + 2x = 500
5x = 500
x = 100
300 appointments with mums
200 appointments with dads
Answer:
A. (x+12)(x-12)
Step-by-step explanation:
Use foil method
x * x = x^2
x * - 12 = - 12x
12 * x = 12 x
12 * - 12 = - 144
x^2 [- 12x + 12x= 0x = 0] - 144
x^2 + 0 - 144 =
x^2 - 144 #