Which of the following combinations cannot be the side lengths of a triangle? 1. 2.3 inches, 3.4 inches, and 3.2 inches
2. 4.8 inches, 5 inches, and 1.2 inches
3. 2.5 inches, 2.5 inches, and 2.5 inches
4. 6.7 inches, 1.1 inches, and 7.9 inches

9514 1404 393

 4.  6.7 inches, 1.1 inches, and 7.9 inches

Step-by-step explanation:

In order for three lengths to be able to form a triangle, the sum of the shorter two must exceed the longest.

1. 2.3 +3.2 > 3.4 . . . will form a triangle

2. 1.2 +4.8 > 5 . . . will form a triangle

3. 2.5 +2.5 > 2.5 . . . will form an equilateral triangle

4. 1.1 +6.7 = 7.8 ≯ 7.9 . . . will not form a triangle

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The symbol ≯ is "not greater than". The typeset version looks like ...

she played for 18.75 hours.

step-by-step explanation:

if she played 2/4 of a hour on tuesday. and there is 60 minutes in an hour and 60 divided by 4 is 7.5. and she played 2/4 of an hour on thursday then again 60 divided by 4 is 7.5, you add 7.5+7.5=56.25. now you have to do 1/4 of an hour, it equals 3.75. now you have to add them all up. 3.75+7.5+7.5=18.75

i hope this and i hope you get it right. it took me a while to get this done for you. : )