The answer is 50
X represents a toaster, x-20 represents a rice cooker
Use the equation 5x+3(x-20)=500
Solve for x and get 70.
A toaster is 70 but a rice cooker is 50
Answer:
there is no question
Step-by-step explanation:
Answer:
See explanation below.
Step-by-step explanation:
The area of a plain domino equal the area of a 2-by-1 board, so it is easy to see that D4=4, D5=5, and so on.
Let's prove by induction than Dn=n for every natural number n.
1) Obviously, D1 is true.
2) Assume now that Dn is true for a given natural n, that is to say, a 2-by-n board can be covered with n dominoes.
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we must prove that this implies D(n+1) is also true.
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But the area of a 2-by-(n+1) board equals the area of a 2-by-n board plus the area of a 2-by-1 board.
By 2), we can cover the 2-by-n board with n dominoes and by 1) we can cover the 2-by-1 board with 1 domino, so we just need n+1 dominoes to cover the 2-by-(n+1) board, which is what we wanted to prove.
Answer: One pound of cinnamon costs $12.80