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vivado [14]
3 years ago
14

If b = 28 when a = 7, find b when a is 5

Mathematics
2 answers:
weqwewe [10]3 years ago
6 0
What's the expression and I think you do 28 times 7 minus 5
max2010maxim [7]3 years ago
3 0
B: a=28:  7=4: 1
if a=5, b=5x4=20
That's your answer lovely~
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Use implicit differentiation to find an equation of the tangent line to the curve at the given point.
andrew11 [14]

Differentiating both sides of

x^2 + 2xy - y^2 + x = 20

with respect to x yields

2x + 2y + 2x \dfrac{dy}{dx} - 2y \dfrac{dy}{dx} + 1 = 0 \\\\ \implies (2x-2y) \dfrac{dy}{dx} = -1 - 2x - 2y \\\\ \implies \dfrac{dy}{dx} = \dfrac{1 + 2x + 2y}{2(y-x)}

At the point (3, 4) (so x=3 and y=4), the tangent line has slope

\dfrac{dy}{dx} = \dfrac{1 + 2\times3 + 2\times4}{2(4-3)} = \dfrac{15}2

Then the tangent line to (3, 4) has equation

y - 4 = \dfrac{15}2 (x - 3) \implies \boxed{y = \dfrac{15}2 x - \dfrac{37}2}

7 0
2 years ago
A yogurt costs 45p. How many yogurts can be bought for five pounds?
LekaFEV [45]
1/9 of a yogurt can be bought with 5 pounds.
3 0
3 years ago
Please help me.<br><br>List the sides of MNP in ascending order:<br>m&lt; M = 15, m &lt; N= 75
oksian1 [2.3K]

Answer:

Take a look at this: brainly.com/question/14269575?referrer=searchResults

Step-by-step explanation:

6 0
3 years ago
Could someone please help me with this thank you very much
elena-s [515]

Answer:

Answer for #10:

y = 2 \: and \: x = 1

Answer for #1:

x = 2 \: and \: y =  - 1

Step-by-step explanation:

In order to solve a simultaneous equation using the substitution method you have to:

Use one of the equation and substitute it into the other equation, in this case equation <em>B</em><em> </em>was substituted into equation <em>A</em><em>.</em>

<em>equ. \: a = (2x - 3y = 7) \\ equ. \: b = (x = 1 - y)</em>

Therefore since x = 1 - y, equation A would be:

2(1 - y) - 3y = 7 \\ (2 - 2y) - 3y = 7 \\  - 2y - 3y = 7 - 2 \\  - 5y = 5 \\ y =  - 1 \: and \: x = 2

8 0
2 years ago
The square below has a side length of 5 cm. What is the length of the missing side? Round your answer to the nearest whole numbe
Misha Larkins [42]

Answer:

D. about 7 cm

Step-by-step explanation:

You can use the pythagorean theorem.

You have a triangle with sides of 5 and 5, so that means the third side is:

a^2 + b^2 = c^2 --> 5^2 + 5^2 = c^2\\25 + 25 = c^2\\50 = c^2\\c = 5\sqrt{2}

rounding:

5\sqrt{2} = 7

5 0
3 years ago
Read 2 more answers
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