exam Maths Puzzle Numerical Ability

my daughter is doing math quiz and doesnt under stand how to find the answer to this problem... find the sum of the first 100 odd numbers?

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exam Other Question

1. Simplify the expression:

15x^2-x-2 / 3x^2-5x-2

2. Simplify the expression:

14x^2y^6z^9 / 7x^5y^4z^11

3. Simplify the expression:

3y^2+5yz+2z^2 / 2y^2+3yz+z^2

4
Solve the following inequalities and graph the solutions on the number line.
2(x-5)-< -35