Answer:
75 ≤ length < 85
Step-by-step explanation:
You know a number 5 or greater will round up to the next higher number in the number place to its left. Similarly, numbers less than 5 round down (get replaced by zero).
This means that 75 will round up to 80. and 84.9999... will round down to 80.
a) The lower bound on length is 75. The length must be at least 75.
b) The upper bound on length is 85. The length must be less than 85.
Answer:
two
Step-by-step explanation:
4×2 because she runs 4 each day
Answer: the shortest side is 30m
Step-by-step explanation:
Let the shortest side be a meters
If side 2 is 16m longer than the shortest side, then it is (16+a)meters.
The same goes with side 3.
Then,
a + (16+a) + (16+a) = 122m
32 + 3a = 122m
Collecting like terms together,
3a = 122 - 32
3a = 90
Divide by coefficient of a
3a/3 = 90/3
a = 30 meters
Check:
30 + (16+30) + (16+30)
30 + 46 + 46 = 112
Just do 3.14+3.14 times the height