exam Maths Puzzle Numerical Ability

If AC=BD,then AB=CD what property is this

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exam Other Question

Caridad is six years older than her sister. Four years ago she was 4 times as old as her sister. how old Caridad. I need some help with this question- I missed the unit lesson and I am having trouble getting the answer.

Given that in an arithmetic sequence t3=-2 and t7=-5, what is the formula for the nth term tn? what is the value of t11

Thanks so much