A young tiger in a zoo weighs 383 pounds. Its sister weighs 449 pounds. Choose all the equations that show a reasonable estimate for their total weight. A. 390 + 450 = 840 B. 400 + 400 = 800 C. 380 + 450 = 830 D. 350 + 450 = 800 E. 300 + 400 = 700

a and c

Step-by-step explanation:

in answer a 390 is 383 rounded up and 450 is 449 rounded up so 840 would be a correct estimated

in answer b 400 is not a good round-up for 383 since it is far out of reach of 383 and 449 so be is an incorrect estimate

in answer c 380 is a great round-down for 383 because its only 3 numbers less then 383 and 450 is good too so this is a correct estimate

in answer d we have a good estimate for 449 but not 383 because the rounded version is not near 350 so this is an incorrect estimate

in answer e the estimates are way to low and to not serve as a good estimate