To calculate 12 x 90, you simply multiply the two numbers together. 12 x 90 = 1080. This is because when you multiply a two-digit number by a two-digit number, you multiply the ones place of the first number by the ones place of the second number, and then the tens place of the first number by the ones place of the second number, and so on.
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90 x 12 = 1080 months
If that's 12 x 90 feet, it's 1080 square feet. If that's 12 x 90 inches, it's 7.5 square feet.
12
Cos(90 - x) = sin(x) so cos2(90 - x) = sin2(x)
There are 7 days in one week. Therefore, 90 days is equal to 90/7 = 12 remainder 6 or 12 weeks 6 days.