Answer:
94
Step-by-step explanation:
the general formula for the nth term of this arithmetic sequence is
a(n) = 12 + 2(n-1).
The 42nd term would then be a(42) = 12+ 2(42 - 1) = 12 + 82 = 94
The probability that a flight that departs on schedule also arrives on schedule
83%×68%=56%
You can identify that "5 over 100" can be written as a fraction. 5 will be the numerator and 100 will be the denominator:

To reduce this fraction, you need to divide the numerator and the denominator by the Greatest Common Factor (GCF) between them.
In this case, to find the GCF, you need to:
- Decompose the number into their Prime Factors:

- Notice that 5 is a common factor. Then, you need to choose the one with the lowest exponent:

Therefore, by dividing the numerator and the denominator by 5, you get:

Hence, the answer is:
Black keys=b
white keys=w
b+w=88|·9
w:b=13/9⇒9w=13b
9b+9w=792
13b+9b=792
22b=792|:22
b=36 keys
w=88-36
w=52 keys