In order for a massive star to form a black hole, it must first
a. expand
b. emit x-rays
c. run out of fuel
d. begin rotating faster

Answerequatorial guinea,gabon, and western sahara;

In a right-angled triangle: 1- the hypotenuse is the longest side2- we can apply pythagorean rule which states that: (hypotenuse)^2 = (side1)^2 + (side2)^2for the given triangle,longest side is 15 cm  side1 = 9 cmside2 is 12 cm  to check whether the triangle is right-angled or not,compare (15)^2 to the summation of (9)^2 and (12)^in other words, compare 225 to the summation of 81 and 144if they are both equal, then the triangle is right-angles, otherwise, it is not.you haven't provided the diagram showing her work, so i cannot tell the choice. however, apply my explanation to the question you have.

Respiratory and cardiovascular diseaseor maybe your looking for the say 2.6 people die from

Where's the we need to see the it could be any country!