The sequence is changing the number -8 is multiplied by by 1 less than the previous number.
The next sequence would be -8 x -1 = 8
The answer would be D.
We know that PQ is 21 cm and QR is 5 cm. There are only 2 possible answer for this and you use only one formula. It's called the Pythagorean theorem.
The first possible is this. If the hypotenuse(the longest side of a triangle) is PR, we do:
a² + b² = c² ←Fill in the numbers
21² + 5² = c²
441 + 25 = c²
466 = c²
√466 = 21.12 cm←Possible length
The second possible is this:
5² + b² = 21²
25 + b² = 441
b² = 441 - 25
b² = 416
√416 = 20.4←Another possible answer
8/11 of the lot was unoccupied. Thus, the # of add'l cars that could be parked there would be (8/11)(231 cars) = 168 (answer).
