The students are selling cookies at a school fair. sara is selling three chocolate chip cookies for $2.49. a) if you wanted to buy one cookie from sara, how much would it cost? d) john is selling seven chocolate chip cookies for $5.39. who offers the better price, sara or john? explain why:

a)

3 chocolate chip cookies  -    $2.49 .

So 1 chocolate chip cookies  costs 2.49/3=$0.83

b)

1 chocolate chip cookie  costs  $0.83

20 chocolate chip cookies cost 0.83*20=$16.6

Full credits to a Brainley User.

option 1 is correct.

step-by-step explanation:

y varies inversely with x and constant of variation is 4

the equation will be:

y = k/x

where k =4 so,

y = 4/x

if we put values of x of option 1 in the above equation and find values of y

y = 4/-2 => y =-2

y = 4/-1 => y = -4

y = 4/1 => y = 4

y = 4/2 => y =2

so, all the values of x and y are correct.

if we put values of x given in other options and find value of y we cannot find whole table satisfying the equation.

hence option 1 is correct.

26 is 33.33% of 78

step-by-step explanation:

26 is what percent of 78?

26 is p% of 78

equation: y = p% * x

solving our equation for p

p% = y/x

p% = 26/78

p = 0.3333

convert decimal to percent:

p% = 0.3333 * 100 = 33.33%