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Paladinen [302]
4 years ago
10

Solve for x. x + 3x + 5 =21

Mathematics
2 answers:
timurjin [86]4 years ago
4 0

Answer:

x=4

Step-by-step explanation:

In order to solve for x, we must isolate x on one side of the equation.

x+3x+5=21

First, combine like terms. x and 3x are both terms with variables, and can be combined.

(x+3x) + 5=21

4x + 5=21

5 is being added to 4x. The inverse of addition is subtraction. Subtract 5 from both sides of the equation.

4x+5-5= 21-5

4x= 16

x is being multiplied by 4. The inverse of multiplication is division. Divide both sides by 4.

4x/4=16/4

x= 16/4

x=4

Let's check our solution. Plug 4 in for x and solve.

x+3x+5=21

4+3(4)+5=21

4+12+5=21

16+5=21

21=21

This solution checks out, so we know our answer is correct.

x is equal to 4, x=4.

lutik1710 [3]4 years ago
3 0

Answer:

x = 4

Step-by-step explanation:

x + 3x + 5 = 21

4x + 5 = 21

4x = 21 - 5

4x = 16

x = 16/4

x = 4

verify:

4 + 3*4 + 5 = 21

4 + 12 + 5 = 21

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Find x such that 3^x = 27 mod 32 (b)
gregori [183]

Answer:

The value of x is 11.

Step-by-step explanation:

Consider the provided information.

It is given that 3^x = 27 mod\ 32

We know that:

3^4=81

Now if we divide the number 81 with 32 it will gives us remainder 17.

This can be written as:

3^4\equiv 17(mod\ 32)

Now use the property: a^n\equiv b^n(mod\ m)

(3^4)^2\equiv 17^2(mod\ 32)

17²=289, if we divide 289 with 32 it will gives us remainder 1, thus.

3^8\equiv 1(mod\ 32)

Multiply both the sides by 3³.

3^8\times 3^3\equiv 3^3(mod\ 32)

3^{11}\equiv 27(mod\ 32)

Hence, the value of x is 11.

7 0
4 years ago
a box in the shape of a rectangular prism has a volume of 56 cubic inches. if the length of each side is multiplied by 2, what w
nexus9112 [7]

Answer:

V = (2·a)·(2·b)·(2·c) = 8·(a·b·c)

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8 0
4 years ago
What is 9/7 as a decimal
siniylev [52]
The answer must be 1.2857142857
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4 years ago
Write down the equation of a line whose slope is 2 and crosses the y-axis at (0,-3).
alexgriva [62]

The equation of the line is y=2x-3.

It is required to find the equation of the line.

<h3>What is straight line?</h3>

A straight line is just a line with no curves .The general equation of a straight line is y = mx + c, where m is the gradient, and y = c is the value where the line cuts the y-axis. This number c is called the intercept on the y-axis. The equation of a straight line with gradient m and intercept c on the y-axis is y = mx + c.

Given:

The slope-intercept form of a line is

y = mx +c

where c is the intercept and m is the slope.

According to given question we have,

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The equation of the line

y=2x-3

Therefore, the equation of the line is y=2x-3.

Learn more about straight line here:

brainly.com/question/27560536

#SPJ1

5 0
1 year ago
A garden hose emits 9 quarts of water in 6 seconds how much did the water emit in 10seconds
jarptica [38.1K]

Answer:

In 10 seconds, the garden hose will emit 15 quarts of water.  

Step-by-step explanation:

The amount of water emitted by the garden hose over time can be expressed as a ratio:  9/6, or 9 quarts of water for every 6 seconds of time.  We can then simplify this ratio to 3/2, or 3 quarts of water for every 2 seconds of time.  Since the ratio will remain constant, or the same, over time, we can set up an equivalent ratio, or fraction to find the amount of water emitted in 10 seconds:  3/2 = x/10.  We look at the denominators and see that 2 x 5 = 10.  In order to make the ratios equivalent, we would also multiply the numerator by 5:  3 x 5 = 15, which gives us the amount of water emitted in 10 seconds.  

7 0
3 years ago
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