Asector of a circle covers 45% of the circle. find the central angle measure of this sector.

Ac contractor is building a new subdivision outside of the city. he has started work on the first street and is planning on the other streets to run in a direction parallel to the first. the second street will pass through (-2,4) find the equation of the location of the second street in standard form. a.2x+y=2 b. x-y=2 c.2x+y=2 d.x+y=2

What is the result of adding the system of equations? 2x+y=4 3x-y=6

Can someone me with #s 8, 9, and 11. with just one of the three also works. prove using only trig identities.