If u varies directly with v and u=6 when v= -7, what is u when v=4. show steps. 

direct variation

u=kv

6=k(-7)

k=-6/7

u=kv

u =-6/7 * 4

u =-24/7

u = -24/7 or -3 3/7

Since u varies directly with v, then

u = kv ( k is the constant of variation )

to find k use u = 6 when v = - 7

k = = = -

thus u = - v

when v = 4, then

u = - × 4 = -

the figures below are made out of circles, semicircles, quarter … find the area and the perimeter of each figure and give your answers as a completely simplified exact value in terms of π (no approximations). remember that we'll also have to cut whatever areas we get in half, since we're only dealing

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