ElectricPavlov

Just in case this is simple interest (meaning the interest is not compounded yearly)

Final Value = 740 +  740 (.09)(8) = 740+740*.09*8 = $ 1272.80

Slope intercept form of a line     y = mx + b     m = slope     b = y-axis intercept (this is when x = 0)

5x + 3y = 3    re-arrange

y = -5/3x +1    m = slope = -5/3       perpindicular slope =  - 1/m   =   3/5

so you now have    y = 3/5 x + b         sub in the values  x = 1   y = 2   (the point given)     to calculate 'b'  and you are done !!

a = # A cans

b = # B cans =  7 - a

3.75 a   +   2.75 (7-a)   =  22.25      solve for 'a' , the # A cans    then Bcans =   7-a

Volume of a cone = 1/3 pi r^2 h      r = 1   h = 3

3 hr  x   10 m/hr = 30 mile

1 hr   x 2 m/hr   = 2 miles      total   32 mile     in   4 hours      32mile/ 4 hour =  8 m/hr

"A belt and a wallet cost $42"

I THINK you might want the cost of a wallet and the cost of a belt.

b + w = 42             b = 42-w    sub this into the following eq

7b + 4w = 213

7(42-w) + 4w = 213     solve for 'w'    then sub this value into one of the equations to solve for 'b' 

You need to do some review of your lessons.....or some learning.   This is too many questions for one post.  

  Do some research and try to answer some of these yourself !

three sectors do not allow movement   (3 out of 8)

3/8 x = 35.9 in²

x = total area = 96 in²

 pi r² = 96 in²          solve for 'r'

the central angle is a fraction of the total    2 pi         and area = pi r²

[4pi/15]   /  [ 2pi ]     x   pi  7^2  =........   in²

Careful :  10 mg is a mass    .01 ml is a volume      this applies to WATER , but not most other substances