4(5x + 6)
to start, let's expand things out, as we cannot learn anything from this form. we get 30x + 20 - 10x + 4, or 20x + 24. to find the gcd (greatest common divisor), we take the terms and try to find the number (or term) that divides them. it must be a constant, because of the 24, and 4 goes into 20 and 24. so, our final answer is 4(5x + 6).
if 5 cakes equal 3.50. we must divide 3.50 by 5 to see the price of just one cake. now since 3.50/5 is 0.70. we must multiply 0.70 by 7. since we have 7 cakes. now we get our simple answer of $4.90.
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