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  1. C

    Use the elimination method to the solve the following system of equation.?

    a) 3x - y = 1 x - 2y = - 2 3x - y = 1 -3x + 6y = 6_____ADD 5y = 7 y = 7/5 x - 14/5 = - 2 x = 4/5 x = 4/5 , y = 7/5 b) x + 2y = - 4 -x + y = - 4______ADD 3y = - 8 y = - 8/3 x - 16/3 = - 4 x = 4/3 x = 4/3 , y = - 8/3
  2. C

    A yardstick's shadow is 4ft. long. A tree's shadow is 20ft. long. estrimate

    Length of stick = 3 ft 3 / 4 = h / 20 15 = h height of tree = 15 ft
  3. C

    A yardstick's shadow is 4ft. long. A tree's shadow is 20ft. long.

    Length of stick = 3 ft 3 / 4 = h / 20 15 = h height of tree = 15 ft
  4. C

    Algebraic methods: the elimination method?

    3x + 4y = 8.1 -3x - 9y = - 12.6_____ADD - 5y = - 4.5 y = 0.9 x + 2.7 = 4.2 x = 1.5 x = 1.5 , y = 0.9
  5. C

    what kind of exercises can i do for my lower abs which do not require me to be on...

    ...my back? I had a procedure done in the past year which makes it very uncomfortable for me to do any kind of exercise while laying on my back. i would like to continue working out my abs, but can't find anything useful online. Any suggestions?
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  6. C

    Simplify this expression?

    5 x^5 --------- 2 y^6
  7. C

    Simplify this expression?

    5 x^5 --------- 2 y^6
  8. C

    simplfy the expression algebra?

    ( ?x - 2?y ) ( ?x - 2?y ) x - 4 (?x ?y) + 4 y x - 4 ?(xy) + 4 y
  9. C

    i forgot how to write an equation in standard form?

    x ² - 4 x - 20 = 0 x = [ - b ± √ ( b ² - 4 a c ) ] / 2 a x = [ 4 ± √ ( 16 + 80 ) ] / 2 x = [ 4 ± √ ( 96 ) ] / 2 x = [ 4 ± 4 √ 6 ] / 2 x = 2 ± 2 √ 6
  10. C

    Test Problem (Law of Cosines)?

    From your directions ( which are unclear ) will assume ∆ ABC where :- AB = 25 is horizontal BC = 30 /_ ABC = 140 ° Using Cosine Rule :- b ² = 25 ² + 30 ² - 2 ( 25 ) ( 30 ) cos 140 ° b = 42.7 miles
  11. C

    college algebra...e^(2x+3)=e^(1/4)?

    2x + 3 = 1/4 2x = - 11/4 x = - 11/8
  12. C

    Determine the vertex and write in standard form?

    I don`t know what the vertex formula is but :- f ( x ) = ( x^2 - 10 x + 25 ) - 25 f ( x ) = ( x - 5 )^2 - 25
  13. C

    the ends of a 30-cm pendulum describe an arc of a 12cm. through what angle does

    C = 2 x π x 30 cm C = 60 π Arc Length (cm)_______Angle at centre ( radians ) 60π____________________2π 12___________________12 / (60π) x 2π = 2/5 Pendulum swings thro` an angle of 2/5 radians = 0.4 radians 2π radians <---------->360° 0.4 radians <-------->0.4 / ( 2π ) x 360 ° = 22.9 °...
  14. C

    find w (omega) for a spoke on a bike revolving 120 times per minute?

    ω = 120 x 2 π radians / min ω = 240 π radians / min ω = 754 radians / min
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