3
4x
−11x−3 by
2
x
−
2x−3
cos(2x+3y)−xsin(2x+3y)(2+3
dx
dy
)=
sinx+ycosx
-3(y+2)
9.86(-x)(3.8-x)=(1+2x)^2
7(5b-2)+9
8x(2x-5)
3(2x-5)+17
3x(3x-2)
x-0.56y=45
x+1.4y=64
the ratio of red marbles to blue marbles in a jar is 5:3.If there are 40 marbles,how many blue marbles marbles are there?
