Please try to follow me, as I demonstrate a method of solution.
This could get complicated. I'll try to go slowly, and you must
stop me if I do anything that's not clear.
Ready ?
You said that -5c/8 = 20
Multiply each side by 8: -5c = 160
Divide each side by 5 : - c = 32
Multiply each side by -1 : c = -32
D) {(-2,3),(-3,3),(-4,3)} Each member of the domain is assigned exactly one member of the range.
The domain must have only one value for y (range), unlike in the other 3 answer choices. If any section of a graph has two different y-values for the same x, then it is not a function.
The three consecutive integers are represented by x, x+1, and x+2
x=(x+1+x+2)-1515
x= 2x+3-1515
x= 2x-1512
-x=-1512
x=1512
Final answer: 1512, 1513, 1514
The answer is 5.5
The standard deviation (sd or σ) of the sample mean difference is:
sd = √(sd₁²/n₁ + sd₂²/n₂)
For the population A:
sd₁ = 17.6
n₁ = 25
For the population B:
sd₂ = 21.2
n₂ = 30
Hence:
sd = √(sd₁²/n₁ + sd₂²/n₂)
= √(17.6²/20 + 21.2²/30)
= √(309.76/20 + 449.44/30)
= √(15.49 + 14.98)
= √(30.47)
= 5.5