Answer:
1) c 2)c 3)b
Step-by-step explanation:
Answer: x^2 + 9x + 20
Step-by-step explanation:
Foil Method: (a + b) (c + d) = ac + ad + bc + bd
Lets say:
a = x
b = 5
c = x
d = 4
Plugging in the numbers: xx + 4x + 5x + 5*4
Combine like terms:
xx = x^2
4x + 5x = 9x
5 * 4 = 20
You're then left with: x^2 + 9x + 20
Answer:

Step-by-step explanation:
Count the number of zeros, if it's a perfect power of 10. :)
Answer:
21/55
Step-by-step explanation:
dividamos por 5
= 21/55