Determine whether the following sets form subspaces of R3 . (a) {(x1,x2,x3)T|x1+x3=1}
(b) {(x1,x2,x3)T|x1=x2=x3}

You and a friend race across a field to a fence and back. your friend has a 50-meter head start. the equations shown represent you and your friend's distances dd (in meters) from the fence tt seconds after the race begins. find the time at which you catch up to your friend. you: d=∣−5t+100∣d=∣−5t+100∣ your friend: d=∣−313t+50∣∣

How do i simply this expression (quadratic formula basis) on a ti-84 or normal calculator?

In the diagram, the ratios of two pairs of corresponding sides are equal to prove that almn - axyz by the sas similarity theorem, it also needs to be shown that x 6 z un z zz un = 2x zləzz lezy