exam Maths Puzzle Numerical Ability

Solve each system of equations. Check by substitution

5x + 3t = 19
5x - 3t = 1

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exam Other Question

a farmer wants to plant 9 trees in 3 rows ,but he wants to have 4 trees in each row show how he can do this

Please answer this for me I am needing some assistance with this problem: Find each of the following products; a (a + 5)(a - 5)

Any help you can assist with this is greatly appreciated. Thanks