(PLATO) Alex's business shows high economic activity that is followed by a slump in growth. Which phase of the business cycle is Alex's business in? A
trough
B. peak
C expansion
D. recession

Magma is outside the volcano  and lava is inside the volcano. 

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.

Ibelieve it is c
c makes more sense when you’re trying to pair them together!