exam Maths Puzzle Numerical Ability

Find the time required for an object to fall to the ground from a building that is 1400ft high. Use t=1/4 (radical sign)s.

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exam Other Question

The section is adding/subtracting radicals. My problem is subtracting.
The equation is: The sqaure root of 120 - The square root of 270 - The square root of 300. Can you help me? How many solutions does the following system have:

4x + 8y = 16
3x + 6y = 9

Explain how to determine the number of solutions without solving the system. Then apply eliminati