Answer: 4(5 + 4)
Step-by-step explanation: Both 16 and 20 are multiples of 4, so factor out 4 and leave the remaining factors in parentheses
4*5 + 4*4 becomes
4(5 + 4) add inside parentheses
4(9) multiply to check
4 × 36
same as adding 20 + 16 = 36
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