Answer:
x = 117km
Step-by-step explanation:
a1 = 18 km
q = 90% = 90/100 = 0.9
a2 = a1 • q = 18 • 0.9 = 81/5 = 16.2 km
a3 = a2 • q = 16.2 • 0.9 = 729/50 = 14.58 km
n = 10
x = a1 • q^n - 1/q - 1 = 18 • 0.9^10 - 1/0.9 - 1 = 117km
Answer:
-6i
Step-by-step explanation:
Complex roots always come in pairs, and those pairs are made up of a positive and a negative version. If 6i is a root, then its negative value, -6i, is also a root.
If you want to know the reasoning, it's along these lines: to even get a complex/imaginary root, we take the square root of a negative value. When you take the square root of any value, your answer is always "plus or minus" whatever the value is. The same thing holds for complex roots. In this case, the polynomial function likely factored to f(x) = (x+8)(x-1)(x^2+36). To solve that equation, you set every factor equal to zero and solve for the x's.
x + 8 = 0
x = -8
x - 1 = 0
x = 1
x^2 + 36 = 0
x^2 = -36 ... take the square root of both sides to get x alone
x = √-36 ... square root of an imaginary number produces the usual square root and an "i"
x = ±6i
Answer:
B
Step-by-step explanation
add all numbers then divide by the number of numbers and you get the means
Step-by-step explanation:
5x+4y=23
= x+y=23-5-4
=x+y=14
l think this is correct!!!!!
Answer:
-1 = x
Step-by-step explanation:
Distribute 2 into x - 10 first to get to this equation which is -22 = 2x - 20. Add 20 on both sides to get -2 on the left side. Divide 2 on both sides to get your x-value which is -1.
