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3 years ago

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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s2008m [1.1K]

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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.

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(x < 0) n (x > 0)

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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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c is the consumption for that year.

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

C = 900 million tons x (1.025^n - 1) / ln(1.025), where

x is a dummy variable and

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0 = 480 billion tons - 900 million tons x (1.025^n - 1) / ln(1.025)

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2 years ago

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2 years ago

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Dmitriy789 [7]

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