exam Maths Puzzle Numerical Ability

The height of a triangle is 4cm less the length of the base. If the area is 30 square cm, what is the height and length of base. I know the formula and I plugged in numbers to find the answers (6cm + 10cm), but I cannot prove it algebraicly.

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i dont know how to start this problem. it tells me to graph the conic section. i know how to graph but i dont know how to format the equation. the equation is (y+4)^2 = x-1 x=20
y= -34 124/435
z= -1993.023



(2^2X3) +81z-9y-2(2x+3-x)+(-9)(x-1/3-7+9z)
_______
4^1-1


I am pretty certain the first "X" is a multiplication symbol. It looks dif