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Maths Puzzle
Numerical Ability
Find a1 of arithmetic sequence from given information.
a7=-45 a15=-77
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please help me solve this equation:0.8 divided by 1/4
1. 37sqrt2x^5-60x^2sqrt50x
2. 44 ^3sqrt135x^5-90x^3sqrt5x^2
3. 13/^3sqrt25x
4. 3/^4sqrt2