CoolStuffYT

We don't even really need trig... the cosine value is already shown in the diagram.

$\Delta PQR \sim \Delta TSR$ because of AAA Similarity ... Angle STR is congruent to itself and angles PQR and TSR are both 90 degrees.

$\frac{PQ}{TS}=\frac{5}{3}$, so this is the ratio for all sides.

Therefore, $15 \div \frac{5}{3}=15 \times \frac{3}{5}=9$

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A

We can cross out B because these were the wealthiest.

We can cross out D because the Han and Romans had great weapon technology.

A makes more sense than C.

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I'm in school right now, an average school day for me

9 1/16=16*9+1=145

145/16*48=145*3=435

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4y=-2x-17

y=-1/2 x-17/4

The slope of a line parallel is the same slope, so it is -1/2.

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Yes, you are right! Thank you!

We can set this so that x^2-6x+8=x-2.

x^2-7x+10=0

(x-2)(x-5)=0

x=2, 5

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