Answer: 2x+5=75. X=35.
Step-by-step explanation: Let’s make the number x. It says twice the number. So that would be x times 2 or two x. Then the sum of twice a number and five. So it would be 2x+5. That equals to 75. So the equation would be 2x+5=75. Then to solve it, subtract five from both sides. 2x=70. Then divide the whole thing by two. X=35.
Answer:
7
Step-by-step explanation:
"a certain whole number" is a number that we don't know, so pick a variable, let's use n
"Twice" means two times, so we'll use 2n for this.
"subtracted from" means the 2n will be AFTER the minus sign.
____ - 2n
What goes in front? "3 times the square of the number" 3n^2
Now we have 3n^2 - 2n
Lastly, we see the result is 133. So this gives us:
3n^2 - 2n = 133 To solve, subtract 133 from both sides of the equation.
3n^2 -2n - 133 = 0 Next FACTOR.
(3n + 19)(n - 7) = 0
3n+19=0 and n-7=0
n=-19/3 and n=7
Since we are looking for a whole number choose n=7
Answer:
D
Step-by-step explanation:
Remark
The circumference of a circle is 2 * pi * r
Given
The circumference (C) = 16 * pi
Solution
2 pi r = 16 pi Divide by 2*pi
r = 16 pi / (2*pi)
r = 8
Answer:
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Step-by-step explanation:
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