3 years ago

Caroline drove 350 miles to her grandmothers house. The trip took her 5 1/4 hours what was her average speed in miler per hour?

Mathematics

1 answer:

SpyIntel [72]3 years ago

8 0

The answer is 66.6 repeated so if you round 66.6 repeated you get 67 so I think the answer is about 67 miles per hour

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Find the measure of ∠C if ∠A = 3 2 x + 20 ∠B = 7 2 x + 20 ∠C = 5 2 x + 40 ∠D = 3 2 x + 10 A) 65° B) 76° C) 95° D) 115°

Rudiy27

The sum of the angles of a quadrilateral is 360°.
$\left(\dfrac{3}{2}x+20\right)+\left(\dfrac{7}{2}x+20\right)+\left(\dfrac{5}{2}x+40\right)+\left(\dfrac{3}{2}x+10\right)=360\\\\9x+90=360\\\\x=\dfrac{270}{9}=30$

Given that x=30, the measure of ∠C is
∠C = (5/2)×30 +40 = 115

The appropriate choice is ...
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