In the circle below diameter cd is perpendicular to chord ab as shown. radii ob and oa are drawn

$4

step-by-step explanation:

$30×5=$150

$150 minus $130=$20

$20÷5=$4.

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b. 1.25 hr

step-by-step explanation:

if you have a constant speed of 60 mph, then you have a ratio between 60 mi. to 1 hr. dividing both sides by 60 we get the ratio

1 mi. to

then mult. both sides by 75 we get the ratio

75 mi. to

simplifying we get

75 mi. to

or 1.25 hr.

the answer is 99.