Simplify: 10x+2x-3= 9 A. x=-1 B. x=-2 C. x=1 D. x=2
2 answers:
Answer:
C. x = 1
Step-by-step explanation:
<u>Combine like terms</u>
10 + 2 − 3 = 9
12 − 3 = 9
<u>Add 3 to both sides of the equation</u>
12 − 3 + 3 = 9 + 3
<u>Add the numbers</u>
12 = 9 + 3
12 = 12
<u>Cancel terms that are in both the numerator and denominator</u>
<u></u><u></u>
<u>Divide the numbers</u>
x = 1
<u>Therefore the correct answer is </u><u>C. x = 1</u>
You might be interested in
Proof:-
In ∆XYZ and ∆VWZ
Hence
∆XYZ∆VWZ(Side-Angle-Side)
Answer:
0.7493 or 74.93%
Step-by-step explanation:
We are given;
Population mean; μ = 100
Population standard deviation; σ = 12
Sample mean 1; x1¯ = 90
Sample mean 2; x2¯ = 120
Z-score formula of the data given is;
z = (x¯ - μ)/σ
z1 = (90 - 100)/12
z1 = -0.83
z2 = (120 - 100)/12
z2 = 1.67
Since we wan to Find the probability that a randomly selected bill is between $90 to $120.
Thus;
P(90 < x¯ < 120) = P(−0.83 < Z < 1.67)
Probability will be gotten from online probability with 2 z-scores calculator to get;
P = 0.7493
