Answer:
20 tests
Step-by-step explanation:
There are six different wires, and for each test the author picks three, this means that each test is a combination of three out of six wires (₆C₃) . The number of total combinations possible is given by:
20 tests are required to verify every possible pairing of three wires.
The answer to this would be
5
s
−
17
z
+
Answer:
A
Step-by-step explanation:
Given the exponential function
f(t) = 228
← where t is time in years
Substitute t = 20 into f(t), that is
f(20) = 228 × 
= 228 × 0.60268.... ≈ 137 → A
Answer:
-36,047.
Step-by-step explanation:
Sum of n terms = a1 .( r^n - 1) / (r - 1)
So Sum of 7 terms = -11 . ((-4)^7 - 1 / (-4-1)
= -11 * -16,385 / -5
= -36,047.
9,000 * 3% = 270
So it would be $270 in sales tax
