23 can round to 20 and 21 can also round to 20 so all u do is 20x20=400 so 400 is your estimated answer
Answer:
The answer is the 2nd option
Step-by-step explanation:
Step-by-step explanation:
512+18=530
423+12=435
5421+14=5435
6324+32=6356
7985+23=8008
Answer:
the answer is 16
Step-by-step explanation:
x^2 + 7 ( x=3)
3^2 + 7
9 + 7 =
16
x^2 would be that number(x) times itself that many times[ in this case it would be the number 2]