Me. Pennington had 6 inches left over.
Explanation.
2 1/4 feet is equal to 27 inches. If he used 21 inches, then he'd had 6 inches left over; 27-21=6.
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For a problem 1 the answer is 3×6+6×9.
for a problem 3 the answer is 9×10+8×7
for problem 4 the answer is 4×8+8×4+8×4.
Answer:
8
Step-by-step explanation:





<u>Solution-</u>
The equation given here,







But, at x=1,
becomes infinity so it can't be a solution to the equation.
∴ x=1 is the extraneous solution of the equation
1/3 = 5/15
1/5 = 3/15
3/15+5/15= 8/15 of the pizza was eaten