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Margaret [11]
3 years ago
9

I am thinking of a number. when it is increasd by 7, it equals 21. what is my number

Mathematics
2 answers:
olga55 [171]3 years ago
8 0
Let the number be x;
x+7=21
Subtracting 7 from each side,
x+7-7=21-7
x=14
andrey2020 [161]3 years ago
6 0
If X is increased by 7 to make 21
X + 7 = 21
then rearrange the equation to get X
X = 21-7
X = 14(b)
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5 0
3 years ago
Which of the following has no solution?
Softa [21]

Answer:

(x + 1 s 1) n (x + 12 1)

(x +1<1) n (x + 1 > 1)

Step-by-step explanation:

Just simplify each the statements.

Then compare and and see if the statements are contradictory and therefore FALSE, if so, then there is no solution.

(x + 1<-1) n (x + 1< 1)

(x <-2) n (x < 0) which is true, so there is a solution.

(x + 1 s 1) n (x + 12 1)

this doesn't make sense so there is no solution.

(x +1<1) n (x + 1 > 1)

(x < 0) n (x > 0)

This is not possible, the statements are contradictory and therefore FALSE, so there is no solution.

5 0
2 years ago
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Step-by-step explanation:

We can model the annual consumption of iron by the equation

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An estimate for the total consumption of iron can now be obtained by integrating this equation with respect to a dummy variable, x from 0 to n.

C = 900*10^6* \int\limits^n_0 {1.025^x} \, dx

This equation simplifies to

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x is a dummy variable and

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We need to find the value of n when R is 0, so

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Simplify this equation to obtain

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2 years ago
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Evgesh-ka [11]

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Step-by-step explanation:

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2 years ago
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Dmitriy789 [7]
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but i might be wrong                    
7 0
3 years ago
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