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makaylahendrix7954
01.07.2020 •
Mathematics
1. A list of 8 numbers is formed such that each new number in the list is the product of the two previous numbers. Find the first number if the last three are shown: 2. What number is directly above 140 in this array of numbers? The pics are attached Have a great day! <3
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Ответ:
1. 1/4 4 1 4 4 16 64 1024
2. 118
Step-by-step explanation:
1. 16 is obtained as 1024/64 = 16
before 16 goes: 64/16 = 4
before 4 goes: 16/4 = 4
before the second 4 goes: 4/4 = 1
before 1 goes: 4/1 = 4
before the third 4 goes: 1/4
2. From row 1 to row k, there are k² numbers (notice that rows finished in 1, 4, 9, etc., all perfect squares). 12² = 144, so 140 is on 12th row.
A number in row k is 2k less than the number directly below it. For example, 3 is on 2nd row, then is 2*2 = 4 units less than the number directly below it, which is 7.
The number above 140 is on the 11th row, then above 140 is 140 - 2*11 = 118.
Ответ:
50.27 cm²
Step-by-step explanation:
Subtract the area of the smaller circle from the area of the larger circle
The area of a circle = πr² ( r is the radius )
area = π × 5² - π × 3² = 25π - 9π = 16π ≈ 50.27 cm² ( nearest hundredth )