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dimulka [17.4K]
3 years ago
13

What is the answer for 13=4x-9

Mathematics
2 answers:
BaLLatris [955]3 years ago
6 0
The answer to this equation is: x=5.5
hichkok12 [17]3 years ago
4 0
Simplifying
13 = 4x + 9

Reorder the terms:
13 = 9 + 4x

Solving
13 = 9 + 4x

Solving for variable 'x'.

Move all terms containing x to the left, all other terms to the right.

Add '-4x' to each side of the equation.
13 + -4x = 9 + 4x + -4x

Combine like terms: 4x + -4x = 0
13 + -4x = 9 + 0
13 + -4x = 9

Add '-13' to each side of the equation.
13 + -13 + -4x = 9 + -13

Combine like terms: 13 + -13 = 0
0 + -4x = 9 + -13
-4x = 9 + -13

Combine like terms: 9 + -13 = -4
-4x = -4

Divide each side by '-4'.
x = 1

Simplifying
x = 1
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A sample of radium has a weight of 1.5 mg and a half-life of approximately 6 years.
pogonyaev

Answer:

0.75 mg

Step-by-step explanation:

From the question given above the following data were obtained:

Original amount (N₀) = 1.5 mg

Half-life (t₁/₂) = 6 years

Time (t) = 6 years

Amount remaining (N) =.?

Next, we shall determine the number of half-lives that has elapse. This can be obtained as follow:

Half-life (t₁/₂) = 6 years

Time (t) = 6 years

Number of half-lives (n) =?

n = t / t₁/₂

n = 6/6

n = 1

Finally, we shall determine the amount of the sample remaining after 6 years (i.e 1 half-life) as follow:

Original amount (N₀) = 1.5 mg

Half-life (t₁/₂) = 6 years

Number of half-lives (n) = 1

Amount remaining (N) =.?

N = 1/2ⁿ × N₀

N = 1/2¹ × 1.5

N = 1/2 × 1.5

N = 0.5 × 1.5

N = 0.75 mg

Thus, 0.75 mg of the sample is remaining.

5 0
3 years ago
The number 1 is an example of an element in the set of natural numbers. true or false​
dangina [55]

Your answer is True!

Some other examples of an element in the set of natural numbers are 2, 3, 4, 5, etc.

Hope this helps you!

~sofia

5 0
3 years ago
The teacher passed out math books. The length is 10 inches and the width is 8 inches. What is the perimeter of each book?
loris [4]
Books are rectangles so that means that opposite sides are equal so if one side is 10 inches then so is the opposite side. same for the 8. the perimeter is the amount around the rectangle so you must add all sides together to find it so

10in+10in+8in+8in= 36in
8 0
4 years ago
Can someone help me how to solve this?
Assoli18 [71]

Answer:

x > -5  in the answer


Step-by-step explanation:

(5 - 3x) / 4 < 5

multiplying both sides by 4:-

5 - 3x < 20

-3x < 15

x > 15/-3

x > -5  (Note the inequality sign is flipped because we are dividing by a negative number)


8 0
4 years ago
If a line has a slope of -4 and a u intercept of 1, which of the following is it's graph?
3241004551 [841]
Well. I can't see the picture. But it would be decreasing at a rate of 4 so pick a point on the any line move over to the right one, then down four. And for the y intercept the line would intersect the y axis at positive one. Sorry if that's confusing
3 0
3 years ago
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