Answer:
x₍ₙ₎ = x₍₁₎ * (-5)ⁿ⁻¹
Step-by-step explanation:
x₍ₙ₎ = x₍₁₎ * (-5)ⁿ⁻¹
x₍₁₎ = -2
x₍₂₎ = (-2) x (-5)²⁻¹ = (-2) x (-5) = 10
x₍₃₎ = (-2) x (-5)³⁻¹ = (-2) x (-5)² = -50
Z-score for 80% to pass = -0.842.

-60.624 = X - 426
X = 426 - 60.624
X = 365
Therefore the required passing score is 365.
To solve this you can make a proportion where the matching sides will correspond to each other. It should look something like this:


Now you must cross multiply
10*42 = 15*x
420= 15x
To isolate x divide 15 to both sides
420/15 = 15x/15
28 = x
Hope this helped!
~Just a girl in love with Shawn Mendes
Answer: Not necessarily an estimate but your answer should be 175.4379 in decimal form.
Answer : 3, 360 ways
Total number of people running the race = 16
We have three slot to be filled for first, second and third
Any person can take the first position irrespective of the arrangement
one out of the 16 people can come first
out of the 15 people remaining , one person can also come second remaining 14
out of the 14 people, one person can also come third
The number of ways the gift can be awarded = 16 x 15 x 14
The nummber of ways the prizes can be awarded = 3360 ways