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tia_tia [17]
3 years ago
11

Someone please help I’m so confused

Mathematics
2 answers:
TEA [102]3 years ago
5 0

Answer:

sorry i cant answer it and it wont let me leave.

Step-by-step explanation:

zalisa [80]3 years ago
3 0
Cross multiply
5(r+5) = 9(r-9)
5r + 25 = 9r - 81
25 = 4r - 81
4r = 106, r = 106/4 = 53/2
The answer is r = 53/2
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Find the average rate of change of f(x)=2x-1 from x=-1 to x=2
MrMuchimi

The average rate of change from x = -1 to x = 2 is 2

<u>Solution:</u>

Given function is:

f(x) = 2x - 1

We have to find the average rate of change from x = -1 to x = 2

<em><u>The average rate of change is given as:</u></em>

\text {Average rate of change}=\frac{f(b)-f(a)}{b-a}

<em><u>The average rate of change from x = -1 to x = 2 is given by formula:</u></em>

\text {Average rate of change}=\frac{f(2)-f(-1)}{2-(-1)}\\\\\text {Average rate of change}=\frac{f(2)-f(-1)}{3}

<em><u>Find f(2) and f( - 1)</u></em>

<em><u>Substitute x = 2 in given function</u></em>

f(2) = 2(2) - 1 = 4 - 1 = 3

<em><u>Substitute x = -1 in given function</u></em>

f( - 1) = 2(-1) - 1 = -2 - 1 = -3

<em><u>Substitute the values in above formula,</u></em>

\text {Average rate of change}=\frac{3-(-3)}{3}=\frac{6}{3}=2

Thus average rate of change from x = -1 to x = 2 is 2

3 0
3 years ago
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Fish A is 2 inches and fish B is 4 inches
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11. Four less than a number tripled is the same number increased by ten.<br> What is the number?
Sphinxa [80]

Answer:

7

Step-by-step explanation:

first, we would set up an equation. let 3x-4 represent "four less than a number tripled". "a number" would be represented by x. let x+10 represent "the same number increased by 10".

set 3x-4 and x+10 equal to each other:

3x-4=x+10

next, we would solve this equation for x. first we would get the x together on one side of the equation. we would do this by subtracting x from both sides to remove it from the right side of the equation:

2x-4=10

then, we would get the 2x by itself. we would do this by adding 4 to both sides:

2x=14

finally, we would divide each side of the equation by 2 to find x:

x=7.

The number is 7.

8 0
3 years ago
How did you identify the line of sight, angle of elevation and angle of depression?
Arturiano [62]

Answer:

The term angle of elevation denotes the angle from the horizontal upward to an object. An observer's line of sight would be above the horizontal. The term angle of depression denotes the angle from the horizontal downward to an object. An observer's line of sight would be below the horizontal.

Step-by-step explanation:

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2 years ago
What is the square root of 4?fffffffffffffffffffffffffffffffffffffffffffff
Mumz [18]

Step-by-step explanation:

\sqrt{a}=b\iff b^2=a\\\\\text{Therefore}\\\\\sqrt4=\pm2\ \text{because}\ (-2)^2=4\ \text{and}\ 2^2=4

3 0
3 years ago
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