Why there is a difference in the time spent per subject.
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Answer: 3 cat stickers and 1 bird sticker
<u>Step-by-step explanation:</u>
To guess, 7 cents total and values of 2 and 1.
I calculated how many times 2 went into 7 and then used the remainder of 1 for the other sticker.
3(2) + 1(1) = 7
To solve mathematically, set up a system of equations:
Value: 2x + 1y = 7
Quantity: x + y = 4