Answer:
The distance around the crater is 9415. If the crater is in the shape of a circle then this distance is the circumference of the circle. The circumference C and diameter D of a circle are related by the formula
C = PI * D
If you plug in 9415 for C and 22/7 for PI and solve for D you get
9415 = (22/7) * D
D = (7/22) * 9415 ~ 2995.7
Step-by-step explanation:
U must like COD
Answer:
Step-by-step explanation:
I assume you mean simple linear equations, maybe not factoring. Anyhow Ill do a few examples:
1. 2x + 5 = 19
2. 14 - 3x = 23
3. 50x / 5 = 150
1. 2x + 5 = 19
Subtract 5
2x = 14
Divide by 2
x = 7
2. 14 - 3x = 23
Subtract 14 to the other side because we have to isolate the term with x in it
-3x = 9
Divide by -3
x = -3
3. 50x / 5 = 150
Multiply by 5 to isolate the value with x
50x = 750
Divide by 50
x = 15
I dont know if this is what you are looking for but this is general idea of how to solve these types of questions. If you need factoring or help with quadratics then let me know!
Answer:
95
Step-by-step explanation:
Let x represent the ones digit. The tens digit will be higher, because reversing the digits results in a lower number. Its value is (14 -x). The given relation is ...
(10(14-x) +x) -(10x +(14 -x)) = 36 . . . . reversing the digits gives 36 less
140 -9x -9x -14 = 36 . . . . eliminate parentheses
90 = 18x . . . . . . . . add 18x-36
5 = x . . . . . . ones digit
14-5 = 9 . . . tens digit
The original number is 95.
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<em>Check</em>
95 -59 = 36
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<em>Additional comment</em>
The difference in value when the digits of a 2-digit number are reversed is always 9 times the difference in the digits. This means the difference in the digits is 36/9 = 4. Since the sum of digits is 14, the two digits are (14+4)/2 = 9 and (14-4)/2 = 5. 95 is the number of interest.
The solutions to a "sum and difference" problem are half the sum and half the difference of the given sum and difference. That is how we know the larger digit is (1/2)(14 + 4), for example.
We worked this "the hard way" using the above equation. It can actually be worked in your head if you're familiar with these generic solutions.
7 ∫ cos(πx) dx
7 [ sin(πx)/π ]
7/π (sin(π/2) - sin(0))
7/π (1 - 0)
7/π ~ 7/3
