Alannah has two lengths of ribbon.
1 answer:
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The proportion that could be used to solve for the variable is ; h = 7.5 ⇒ answer b
Step-by-step explanation:
A proportional relationship: one variable is always a constant value times the other, that constant is called the constant of proportionality
- y = k x is the equation of the proportional relationship
- We can write the proportional relationship in the form
The number of walls and the number of hours are increased or decreased together
∴ The number of walls and the number of hours are proportion
∵ 16 walls in 40 hours
∵ 3 walls in h hours
- By using the second rule above
∴
The proportion that could be used to solve for the variable is
Let us solve it to find h
∵
- By using cross multiplication
∴ 16 × h = 3 × 40
∴ 16 h = 120
- Divide both sides by 16
∴ h = 7.5
The value of h is 7.5 hours
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Answer:
673 people
Step-by-step explanation:
Statistics<3
Use the margin of error formula.
ME = t*
- Margin of error or ME = 3
- Critical t or t* with a confidence level of 95% on the calculator is invNorm(.975) = 1.96. You would use invt, except you don't have the degrees of freedom, so you can approximate with invNorm. It's close enough.
- Standard deviation or s = 39.7
- Solve for n!
3 = 1.96*
3/1.96 =
1.531 =
39.7/1.531 =
25.937 =
25.937^2 = ^2
672.7 = n
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