exam Maths Puzzle Numerical Ability

Find the value of c that makes x^2+5x+c a perfect square trinomial.

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exam Other Question

once again i had to write in the simplest form without negative exponents. my probelm was 10^-3 and i got 1/(over) 10^3 = 1/(over) 100 is this right?? Radical Expressions
simplify.
I am trying to help my daughter with her homework and I am at a loss. I have never seen problems like these, and surely am at a loss as where to start with them.
/810+/240-/250