Determine whether the ratios 5:7 and 10:21 are equivalent

Step-by-step explanation:

No, thoose two ratios are not equivalent, but I can show you the ones that are  equivalent, {You can write 5/7 or 10/14 or 20/28 or 40/56. There! 3 equivalent ratios.}

gdp is the best phrase!

c

step-by-step explanation:

it would be see because your formula is f(x)=6x, so 6 times 1 is 6 and you go on and the best answer is c.