exam Maths Puzzle Numerical Ability

Please help me Multiply and simplify completely this problem. 5i*5i

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exam Other Question

can you please help me solve and check this problem using the substitution method. (((y=5x 2x+y=28))) Could someone PLEASE graph these equations for me? Thank you!!
(a) 2
(b) 1/2
(c) -2
(d) -1/2