2 years ago

HELP ME PLEASEEEEE

Mathematics

1 answer:

Klio2033 [76]2 years ago

5 0

D. It would take 4. 1/2 hours to complete 9 pages because he writes at a rate of 2 pages per hour.

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Step 3. Solve the equation.
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Step 5. Check answer.
Hope this helps...?

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3 years ago

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Should be D.

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3 years ago

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lisabon 2012 [21]

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3 years ago

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the question is in the picture below, if you could show all your work so i can see how to do it, that would be appreciated.

ki77a [65]

m∠R = 27.03°

Solution:

Given In ΔQRP, p = 28 km, q = 17 km, r = 15 km

To find the measure of angle R:

Law of cosine formula for ΔQRP:

$r^{2}=p^{2}+q^{2}-2 pq \cos R$

Substitute the given values in the above formula.

$(15)^{2}=(28)^{2}+(17)^{2}-2 (28)(17) \cos R$

$225=784+289-952 \cos R$

$225=1073-952 \cos R$

Switch the given equation.

$1073-952 \cos R=225$

Subtract 1073 from both side of the equation.

$-952 \cos R=-848$

Divide by –952 on both sides.

$$ \cos R=\frac{106}{119}$

$$ R=\cos^{-1} \left(\frac{106}{119}\right)$

$R=27.03^\circ$

Hence m∠R = 27.03°.

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3 years ago