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navik [9.2K]
3 years ago
14

A math class has 12 girls and 14 boys. Four students are chosen at random to represent the class at a math competition. What is

the probability that all of the students chose are boys?
Mathematics
1 answer:
mariarad [96]3 years ago
8 0
Probability of all chosen students being boys:

4/26 or 2/13
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Jamie bought medicine priced at $180 she had to pay 5% sales tax and an additional 1.5% for handling fee how much money did she
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Answer:

$191.70

Step-by-step explanation:

total amount spent = cost of medicine + cost of tax + cost of shipping

cost of tax = 0.05 x $180 = $9

cost of shipping 0.015 x $180 = $2.70

total cost = $180 + $9 + 2.70 = $191.70

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3 years ago
A potential energy function is given by U = A x3 + B x2 − C x + D . For positive parameters A, B, C, D this potential has two eq
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Answer:

7.8655

Step-by-step explanation:

Given the functionl

U=Ax^3+Bx^2-cx+D

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We have, replacing,

U=1.45x^3+2.85x^2-1.7x+0.6

We need to derivate and verify for stable equilibrum that,

\frac{d^2 U}{dx^2}>0

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U'(x) = 4.32x^2+5.7x-1.7

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x_1=-1.57008\\x_2=0.250636

We obtain U"(x), then we have

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For x=-1.57, U"(x)=-7.86549 Unestable

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3 years ago
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natka813 [3]

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Step-by-step explanation:

make an equation based off this ratio -- 36 calls: 2.25 hours and x calls: 1 hour

36/2.25 = x/1

cross multiply to get 36=2.25x

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