Mathematics: If r, p, and q are given, then explain whether the Law of Sines or the Law of Cosines should be used to solve for ∠Q. Law of Cosines, two sides and the included angle are known Law of Cosines, all sides are known Law of Sines, two sides and an opposite angle are known Law of Sines, two angles and the included side are known

If r, p, and q are given, then explain whether

nguyenhoangthienkim0

28.01.2022

Law of Cosines, all sides are known

Step-by-step explanation:

q² = p² + r² − 2pr cos(Q) or

$\frac{-q^{2}+p^{2}+r^{2} }{2pr}$ = cos (Q)

Q = $cos^{-1}$ $(\frac{-q^{2}+p^{2}+r^{2} }{2pr})$

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skywil8981

17.03.2023

a = - 9

Step-by-step explanation:

a + (-4) = -13

Add 4 to both sides

a + (-4) + 4 = -13 + 4

a + 0 = -9

a = -9

When two numbers have different sign, subtract and the result will have the sign of the bigger number

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