The period of oscillation of a pendulum is

Where L is the length of the pendulum and

the gravitational acceleration.
Re-arranging the formula and using T=1.0 s, we find the length of the pendulum:
Answer:
There are 24 girls.
Step-by-step explanation:
56 total students divided into 7 parts (4 parts boys and 3 parts girls) is 8.
8 times 3(ratio of girls) is equal to 24.
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X^2 + 2x + x^2 + 5x
2x^2 + 7x