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part a)

L=250 is correct

m<A is NOT equal to m < B

tan(delta)=200/150 ...........< delta (inner angle in right triangle, upper corner to the left) is equal to <A as angles with one common leg and two other legs are parallel

tan(A)=tan(delta)=200/150

<A= tan^-1(200/150)

<A=53.13°

then <B=90-<A
<B=90-53.13°
<B=36.87°

part b)

given: speed s=35mph
L=250ft

convert ft to miles
250ft=0.0473485mil

convert h to seconds
1h=3600s

L=s*t

0.0473485mil=(35mil/3600s)*t

t=(0.0473485mil)/(35mil/3600s)

t=4.87 seconds

<blockquote data-quote="MathLover1" data-source="post: 1098993" data-attributes="member: 280">part a) &nbsp;L=250 is correctm&lt;A is NOT equal to m &lt; Btan(delta)=200/150 ...........&lt; delta (inner angle in right triangle, upper corner to the left) is equal to &lt;A as angles with one common leg and two other legs are paralleltan(A)=tan(delta)=200/150&nbsp;&lt;A= tan^-1(200/150)&lt;A=53.13°then &lt;B=90-&lt;A&lt;B=90-53.13°&lt;B=36.87°part b) given: speed s=35mphL=250ft&nbsp;convert ft to miles250ft=0.0473485milconvert h to seconds1h=3600sL=s*t0.0473485mil=(35mil/3600s)*tt=(0.0473485mil)/(35mil/3600s)t=4.87 seconds</blockquote>

[QUOTE="MathLover1, post: 1098993, member: 280"] part a) [B]L=250[/B] is [B]correct[/B] [B]m<A is NOT equal to m < B[/B] tan(delta)=200/150 ...........[B]< delta[/B] (inner angle in right triangle, upper corner to the left) is[B] equal to <A [/B]as angles with one common leg and two other legs are parallel tan(A)=tan(delta)=200/150 <A= tan^-1(200/150) [B]<A=53.13°[/B] then <B=90-<A <B=90-53.13° [B]<B=36.87°[/B] part b) given: speed s=35mph L=250ft convert ft to miles 250ft=0.0473485mil convert h to seconds 1h=3600s L=s*t 0.0473485mil=(35mil/3600s)*t t=(0.0473485mil)/(35mil/3600s) [B]t=4.87 [/B] seconds [/QUOTE]