exam Maths Puzzle Numerical Ability

i have 3 questions.

1) 7 times the difference between d and 11
2) The number s divided by the sum of t and u
3) the number r added to the product of a and c

thank you.

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exam Other Question

figure out the y-intercept of the graph of the equation y=x2 (this is x squared) 6x = 9 and -3/2 (x-6)2 (squared). Is this rational or irrational:

sqrt -

I believe this is irrational because there is no numbers involved in this, am I correct? Thank you very much!