book Maths Puzzle Numerical Ability

A school club sold calculators to raise money for a field trip. The members sold small calculators for $5 each and large ones for twice as much as the small calculators. At the e

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book Other Question

Use the properties of addition and multiplication to complete the statement.

(5 + 18) + 4 = 5 + ( ____ + 4) What is the equation of the line passing through the points
(-3,8) and (-4,-5)

A)y=13x-47
B)y=13x+47
C)y=13x-31
D)y=-13x-31

Please show me all your work so that I can learn how to do this..thanks