book Maths Puzzle Numerical Ability

How many X-intercepts does the parabola have? Does its vertex lie above below or on the X-axis?

Can some help me solve?

Y=-X^2+2X-1

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book Other Question
how do I figure out this type of problem 4 is what percent of 5? PLEAS I NEED HELP

1.IF ONE OF THE ANGLES IN A RIGHT TRIANGLE MEASURES 45 DEGREES, WHAT ARE THE MEASURES OF THE OTHER TWO ANGLES?

2.FIND THE PERIMETER OF A TRIANGLE WITH SIDES OF 4M, 2.3 M AN 3.7 M

PLEASE HELP