I kinda need help What is the fraction 1/4 in decimal form?

I need help with this one to

Solve 3^3

Which describes the difference between the graph of f(x)=x^2 and g(x)=-(x^2-2)

Arace is 10 kilometers long.markers will be placed at the beginning and end of the race course and at each 500 meter mark.how many markers are needed to mark the course for the race?

X+ 4y − z = −14 5x + 6y + 3z = 4 −2x + 7y + 2z = −17