math

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can someone answer these ive been stuck on them for almost 2 hours !!!!!

1.which pair of ratio form a proportion? choose all that apply.

A. 1/6, 4/20
B. 7/9, 28/36
C. 14/18, 21/27
D. 30/80, 8/18

2.which pair of ratios does not form a proportion?

A. 3/5, 24/40
B. 30/10, 15/3
C. 9/14, 3/4
D. 7/12, 14/24

3.for which value of m is 4/16=m/24 a proportion?

A. m=6
B. m=8
C. m=12
D. m=14

  • math -

    (7/9)(4/4) = 28/36
    14/18 (3/2 / 3/2) = 21/27

    The easy way is to use your calculator, for example 14/18 = .777777..... and 21/27 =.77777.....
    but
    30/80 = .375 and 8/18 = .4444...

    2.
    3*6 = 24 but 5*6 = 30 not 40
    30/2 = 15 but 10/5 = 5 not 3
    14/3 no way
    but
    7*2 = 14 and 12*2 = 24 YES

    3.
    16 m = 4*24
    m = 6

    check
    4/16 = 1/4
    6/24 = 1/4 yes

  • math -

    1. is b and c

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