Francine used her computer for 2 1/8 hours Tuesday evening and for 2 1/4 hours on Wednesday evening. Which is the best estimate of the time Francine used her computer on Tuesday and Wednesday evenings?
A) about 1/4 hour
B) about 3hours
C) about 4 hours
D) about 5 hours
Yes, Anna/Nini, 4 hours is correct.
The answer is 4 hours.
To get the best estimate of the time Francine used her computer on Tuesday and Wednesday evenings, we need to add the total hours she used on both evenings.
On Tuesday evening, she used the computer for 2 1/8 hours, which is the same as 2 + 1/8 hours.
On Wednesday evening, she used the computer for 2 1/4 hours, which is the same as 2 + 1/4 hours.
To add these two amounts, we need to find a common denominator for 8 and 4, which is 8.
2 + 1/8 can be written as 16/8 + 1/8 = 17/8.
2 + 1/4 can be written as 8/4 + 1/4 = 9/4.
Now, we can add the fractions:
17/8 + 9/4 = (17 * 2)/(8 * 2) + 9/4 = 34/16 + 9/4 = 43/16.
So, Francine used her computer for a total of 43/16 hours on Tuesday and Wednesday evenings.
To find the best estimate of this time, we can round the fraction to the nearest whole number.
43/16 is closest to 3 when rounded, so the best estimate of the time Francine used her computer on Tuesday and Wednesday evenings is about 3 hours.
Therefore, the correct answer is B) about 3 hours.