exam Maths Puzzle Numerical Ability

Solve the following simultaneous equation
32x^2+15y^2=2112
7x^2-3y^2=60

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exam Other Question

The formula R= -0.075t+3.85 can be used to predict the world record in the 1500 meter run, t years agter 1930. Determining an inequality that identifies the years in which the world record will be less than 2.8 minutes. Sovle for t. Thanks for your time. ((-6.9+7.7)/-2 )+1

OK this one I am totally LOST. I do not no what any of this means what is the (( and the /-2 mean?? I cant even find this in my textbook. Can someone please explain to me how this problem is actually work out? Thank you much.