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nikklg [1K]
3 years ago
13

What is 47x -38x+200= -47x +38x+200 ?

Mathematics
2 answers:
Natali5045456 [20]3 years ago
5 0
X=0 I think......xxx
ella [17]3 years ago
4 0

47x -38x+200= -47x +38x+200

9x+200=-9x+200

9x+9x+200=-9x+9x+200

18x+200=200

18x+200-200=200-200

18x=0

Divide by 18 for 18x and 0

18x/18=0/18

x=0

Check answer by using substitution method

47(0)-38(0)+200=-47(0)+38(0)+200

0+200=0+200

200=200

The answer is x=0

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15. The equation below defines z as a differentiable function of x and y. Find the value of dz/dy at the point (1, 1, 1).
MariettaO [177]

Isolate the term with z^2.

x^2 - 5y^2 + xyz^2 = y - 4 \implies xyz^2 = -x^2 + 5y^2 + y - 4

Differentiate both sides with respect to y.

\dfrac{\partial(xyz^2)}{\partial y} = \dfrac{\partial(-x^2 + 5y^2 + y - 4)}{\partial y}

By the product and chain rules,

xz^2 + 2xyz \dfrac{\partial z}{\partial y} = 10y + 1

Solve for the partial derivative, then evaluate at (x,y,z) = (1,1,1).

\dfrac{\partial z}{\partial y} = \dfrac{10y + 1 - xz^2}{2xyz}

\dfrac{\partial z}{\partial y} \bigg|_{x=1,y=1,z=1} = \dfrac{10 + 1 - 1}{2} = \boxed{5}

4 0
2 years ago
Put these in order starting from the smallest 3/4. 0.72 4/5 0.799 9/10
Yakvenalex [24]

Answer:

0.72, 3/4, 0.799, 4/5, 9/10

Step-by-step explanation:

Let's start by converting all of these into decimal form to make this easier.

3/4=0.75, 4/5=0.8, and 9/10=0.9.

Now, it's clear that the correct order is:

0.72, 0.75, 0.799, 0.8, 0.9

Converting the fractions back, you get:

0.72, 3/4, 0.799, 4/5, 9/10

Hope this helps!

4 0
3 years ago
Mrs. Bryant is making 17
torisob [31]
The answer is 1940 or 7:40 which is 5 hours earlier than when she started.

To get the answer you multiply 17 by 30 which is 510. Next you add 510 and 1430 which is 1940. To get to regular time and not military time, subtract 12 from 19 and there you go! Hope this helps!!:))))))
4 0
3 years ago
If you're going 45 miles per hour, and you're traveling to a house 135 miles away, how many hours will it take to get there?
Andrei [34K]
Simply divide distance by miles per hour.  135/45=3.  3 Hours.  
4 0
4 years ago
Read 2 more answers
A line passes through the point (8,7) and has a slope of negative 3/4 Write an equation in slope-intercept form for this line.
Anton [14]

Answer: Y= -3/4x+13


Step-by-step explanation:

A line passes through the point (8,7) and has a slope of negative 3/4 Write an equation in slope-intercept form for this line.

This is what i get

Slope of a line Y= mx+b

Y= 7

X= 8

M= -3/4


7= -3/4(8)+b

7= -6+b

7+6=b

13=b


Y= -3/4x+13

6 0
3 years ago
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