Find the missing number in this proportion.

7/35=28/?

120
140
180
190

Identify an equation in point slope form for the line perpendicular to y=3x+5 that passes through (4,-1)

An airplane travels at an unknown elevation before it descends 3 miles to an elevation of 15 miles. find the elevation of the plane before its descen.

Non-euclidean geometry was discovered when, in seeking cleaner alternatives to the fifth postulate, it was found that the negation could also be true a. true b. false