Find the unknown angle A

A=120°

Step-by-step explanation:

(4-2)×180=360

360-70=290

290-80=210

210-90=120

A=120°

Hope this helps! :)

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.