exam Maths Puzzle Numerical Ability

I am wondering if I can get help with this particular question. I have write it in exponential form.
What I got for this was
4_____
1 / 2 , but it was wrong

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exam Other Question

In an electronics experiment 1 white cord is connected to 3 black cords. Each black cord is connected to 5 gray cords. Each gray cord is connected to 7 blue cords. How many blue cords are there? can someone help me with this problem:

Determine whether the equation defines y as a function of x.

y = check sign(4x - 3)


a. y is a function x
b. y is not a function of x