What is the next number in this matchsticks series riddle?

Different lights make me strange by changing me into different sizes. What am I?

It is raining today at 11:59 am. What is the probability of sunny weather after 72 hours?

Find The Next Number In The Sequence

30 10 15 13 0 16 -15 ?

In my garden, I have many trees but only one of them is the mango tree. In these mango trees, there are some mangoes(as expected).

But after a strong wind, there are neither mangoes on the tree nor on the ground. Explain?

2, 3, 5, 9, 17, _ What is the next number in the sequence?

Three cars are driving on a track that forms a perfect circle and is wide enough that multiple cars can pass anytime. The car that is leading in the race right now is driving at 55 MPH and the car that is trailing at the last is going at 45 MPH. The car that is in the middle is somewhere between these two speeds.
Right now, you can assume that there is a distance of x miles between the leading car and the middle car and x miles between the middle car and the last car and also, x is not equal to 0 or 1.
The cars maintain their speed till the leading car catches up with the last car and then every car stops. In this scenario, do you think of any point when the distance between any two pairs will again be x miles i.e. the pairs will be x distance apart at the same time ?

Andrew sees a very rare bird named "Ruppell's vulture". Soon Andrew was dead. Can you explain the mystery, Mr. Sherlock?

Find the value of "?" in the ball picture Riddle below:

Use only one mathematical symbol and all numbers (0-9) to get a sum of 99