The service tip for the waiter is 20%. the total cost of a meal is calculated as c + 0.20c. how much would you have to pay if you have a meal that costs $21.00?

For this case we have the following function, to calculate the total cost of the meal, including 20% of the tip:

They tell us that a meal costs $ 21.00. That is,

Thus, the total cost of the meal is 25.2

$ 25.2

the answer would be d

straight away you can eliminate a and c because not all books contain a scientific skill because some may be fiction. c is also wrong because it saids that the only way children can learn is through books which is incorrect.

b is also wrong because reading can be a scientific skill but not always, therefore it is wrong which leaves you with d, the correct answer since it said that it can children learn.

hope this ! : 3