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Tom [10]
3 years ago
13

Marcus completed 187 jumping jacks in 3 days. He completed 60 jumping jacks on each of the first 2 days, and y number of jumping

jacks on the third day. Which equation can be used to find y, the number of jumping jacks Marcus completed on the third day? A.y = 187 + (60 × 2) B.y = 187 − (60 × 2) C.y = 187 − (60 ÷ 2) D.y = 187 + (60 ÷ 2)
Mathematics
2 answers:
grandymaker [24]3 years ago
8 0
B..................................................

scoray [572]3 years ago
4 0
187 jumping jacks in total
60 for each of the first 2 days
y=number of jumping jacks on day 3
187=y+2(60)
187-2(60)=y
Solution: B. y=187-(60×2)
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Find the exact value of cos(sin^-1(-5/13))
son4ous [18]

bearing in mind that the hypotenuse is never negative, since it's just a distance unit, so if an angle has a sine ratio of -(5/13) the negative must be the numerator, namely -5/13.

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\bf \textit{using the pythagorean theorem} \\\\ c^2=a^2+b^2\implies \pm\sqrt{c^2-b^2}=a \qquad \begin{cases} c=hypotenuse\\ a=adjacent\\ b=opposite\\ \end{cases} \\\\\\ \pm\sqrt{13^2-(-5)^2}=a\implies \pm\sqrt{144}=a\implies \pm 12=a \\\\[-0.35em] ~\dotfill\\\\ cos\left[ sin^{-1}\left( -\cfrac{5}{13} \right) \right]\implies cos(\theta )=\cfrac{\stackrel{adjacent}{\pm 12}}{13}

le's bear in mind that the sine is negative on both the III and IV Quadrants, so both angles are feasible for this sine and therefore, for the III Quadrant we'd have a negative cosine, and for the IV Quadrant we'd have a positive cosine.

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2 years ago
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Dafna1 [17]

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4 0
3 years ago
Find the distance between points P(5, 1) and Q(1, 3) to the nearest tenth.
bonufazy [111]

Answer:

Idk if its multiple choice but you can do 1 of 2 ways theres using distance formula =√(5-3)sq+(1-4)sq

=√4+9

=√13 <--

or

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Given: The two points that are P(5,1) and Q(3,4).

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The distance between these two points can be found out as using the distance formula that is: 3.6

Thus, the distance between the given two points is 3.6 units.

So you choose 13 or 3.6 Hope this helps :)

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