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Maths Puzzle
Numerical Ability
i really need ur help solving this equation: 21x+3=121
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my questions is :
find the value of r so that the line through (8,r) and (4,5) has a slope of -4.
a.11
b.-11
c.4
d.-4
thanks for your help!
a vending machine takes only nickels and dimes. there are 5 times as many dimes as nickels in the machine. the face value of the coins is $4.40 how many of each coin were in the ma