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USPshnik [31]
2 years ago
10

Seven times the sum of a number and 1 is 28.

Mathematics
2 answers:
jekas [21]2 years ago
8 0

Answer:

3

Step-by-step explanation:

k12

lisabon 2012 [21]2 years ago
5 0

The number in the question that gives 28 after the operations is; <em><u>3</u></em>

We are told that the product of seven and the sum of a number and 1 is 28.

Let the number be x. Thus;

7(x + 1) = 28

Use division property of equality to divide both sides by 7.

7(x + 1)/7 = 28/7

(x + 1) = 4

Use subtraction property of equality to subtract 1 from both sides to get;

x + 1 - 1 = 4 - 1

x = 3

Therefore, in conclusion the number is 3.

Read more at; brainly.com/question/10465740

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Find the derivative of sinx/1+cosx, using quotient rule​
Mrrafil [7]

Answer:

f'(x) = -1/(1 - Cos(x))

Step-by-step explanation:

The quotient rule for derivation is:

For f(x) = h(x)/k(x)

f'(x) = \frac{h'(x)*k(x) - k'(x)*h(x)}{k^2(x)}

In this case, the function is:

f(x) = Sin(x)/(1 + Cos(x))

Then we have:

h(x) = Sin(x)

h'(x) = Cos(x)

And for the denominator:

k(x) = 1 - Cos(x)

k'(x) = -( -Sin(x)) = Sin(x)

Replacing these in the rule, we get:

f'(x) = \frac{Cos(x)*(1 - Cos(x)) - Sin(x)*Sin(x)}{(1 - Cos(x))^2}

Now we can simplify that:

f'(x) = \frac{Cos(x)*(1 - Cos(x)) - Sin(x)*Sin(x)}{(1 - Cos(x))^2} = \frac{Cos(x) - Cos^2(x) - Sin^2(x)}{(1 - Cos(x))^2}

And we know that:

cos^2(x) + sin^2(x) = 1

then:

f'(x) = \frac{Cos(x)- 1}{(1 - Cos(x))^2} = - \frac{(1 - Cos(x))}{(1 - Cos(x))^2} = \frac{-1}{1 - Cos(x)}

4 0
3 years ago
A freight train is traveling at an average rate of 45 miles per hour. Which equation represents the situation?
ollegr [7]
Hi there!

The answer would be A. m = 45h

Hope this helps
6 0
2 years ago
Read 2 more answers
What is the value of b^2 0 4ac for the following equation?<br> 2x^2 0 2x 0 1 = 0<br> 04<br> 0<br> 12
tigry1 [53]
<span>2x^2 - 2x - 1 = 0 a = 2, b = -2, c = -1 b^2 - 4ac = (-2)^2 - 4(2)(-1) = 4 + 8 = 12
so the answer is 12
</span>
3 0
3 years ago
8 * 10e(-3) idk i used other websites and the answers were wrong
Travka [436]
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7 0
3 years ago
1. For the function f(x) = 5, determine each of the following values.
Bess [88]

Answer:

f(4) = 5

Step-by-step explanation:

f(x) = 5.

Whatever value of x you input to the function , the function's value is always 5.

This is seen when you examine the graph of f(x) = 5. It is a straight horizontal line passing through y = 5. For every value of x along the line, f(x) = y = 5.

8 0
3 years ago
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