8v + 8b = 240
4v + b = 54
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Modify:
8v + 8b = 240
8v + 2b = 108
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Subtract and solve for "b":
6b = 132
b = 22 (# of students in each bus)
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Solve for "v":
4v + b = 54
4v + 22 = 54
4v = 32
v = 8 (# of students in each van)
Answer:
$650
Step-by-step explanation:
$50 + $75(8)
= $50+ $600
= $650
This problem lends itself to the binomial probability approach.
Focus on students who are not secretly robots.
Then P(student is not a robot) = 2/6, or 1/3. Here n=6 and x=2.
Then the desired probability is binompdf(6,1/3, 2), which, by calculator, comes out to 0.329.
Dilation creates similar triangles, all the others are isometries, making congruent triangles. Choice a.
