Barb solved the following equation: 4(3x – 12) = 5(2x + 6)
2 answers:
<u><em>x=39 is the right answer. </em></u> First you had to add by 48 from both sides of the equation. And it gave us, . Then simplify, and it gave us
. Next, subtract by 10x from both sides of equation. And it gave us,
. And then simplify, and it gave us,
. You can also divide by 2 from both sides of the equation. And it gave us,
. And finally, simplify and the answer is<u><em> x=39</em></u> is the right answer. Hope this helps! Thank you for posting your question at here on brainly. And have a great day! -Charlie
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Answer:
<h2>25</h2>Step-by-step explanation:
Answer:
0.8224
Step-by-step explanation:
Data
- mean: $76
- standard deviation, sd: $10
- first value of interest, x1: $63
- second value of interest, x2: $90
z-score for x1:
z1 = (x1 - mean)/sd = (63 - 76)/10 = -1.3
z-score for x2:
z2 = (x2 - mean)/sd = (90 - 76)/10 = 1.4
The proportion of wrist watch prices are between $63 and $90 is:
P(z1 < z < z2) = P(z < 1.4) - P(z < -1.3)
P(z < 1.4) = 0.9192 (see first picture attached)
P(z < -1.3) = 0.0968 (see second picture attached)
P(z1 < z < z2) = 0.9192 - 0.0968 = 0.8224
