Assume the cost of a cookie is $x, the cost of a brownie is $y and the cost of a cupcake is $z.
It is given that 6 cookies and 2 brownies cost the same, so 6x = 2y, take this as equation 1.
It is also given that 4 brownies cost the same as 10 cupcakes, so 4y = 10z, take this as equation 2.
If we divide equation 2 by 2 we get, 2y = 5z so that the y value is the same as equation 1 and we can equate equation 1 and 3.
We get 6x = 2y = 5z, 6x = 5z, dividing both sides by 5, we get 1.2x = z.
We need to calculate how many cupcakes Bob can buy for the price of 18 cookies, So we must find the z value when the x = 18.
If we multiply 1.2 with 15 we get 18 so we the last equation is multiplied with 12 so that 18x = 15z. 18 cookies and 15 cupcakes cost the same.

4 0

3 years ago

WINSTONCH [101]

Answer:

What is (f–g)(x)?

f(x)=

–

2x2+10x

g(x)=11

–

3x2

Step-by-step explanation:

5 0

2 years ago

Anastaziya [24]

You should only buy two bags of buns

5 0

4 years ago