A. c = 4d/5 so i went through all the choices and multiplied it by 5 then divided it by 4. i then subtracted the options from my value.
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A × B + C - C - A
1 × 4 + 3 - 3 - 1
4 + 3 - 3 - 1
7 - 3 - 1
4 - 1
3
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These ratios are not proportional.
Explanation:
If the ratio 8:32 were simplified, it would equal 1:4 because they can both be divided by 8. But since 16 x 4 does not equal 72, they cannot be divided by 4 to make a simplified ratio such as the first example.
Hope I helped, and good luck!
Rate of change= (y2-y1)/(x2-x1)=(306-360)/(16-10)= - 54/6= - 9