exam Maths Puzzle Numerical Ability

i need help on dis problem:what is the x-intercept for the function y=-3x+7

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Hi could someone please help me with this problem. Thanks.
Using coins which may have values of 1, 5, 10, 25, or 50 cents, what is the maximum number of cents you may have without how to get the area if i have trapezoid and it's sides are 50,45,70 and 45?