math
posted by annabelle .
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

(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 
1. is b and c
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