3 years ago

What is 8(7x-2)-x=424 ?

1 answer:

3 0

X=8 i did mental math but 56x-16-x=424
                                            +16      +16
55x=440
   /55 /55
                                                x=8

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QUICK QUESTION! PLEASE ANSWER FAST!

mr_godi [17]

A^2 + B^2 = C^2
7^2 + B^2 = 25^2
49 + B^2 = 625
-49 -49
B^2 = 576
Square root both sides
B = 24

4 0

3 years ago

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the endpoints of the side of rectangle ABCD in the coordinate plane are A (3,7)and B(4,1).Find the equation of the line that con

Elden [556K]

Answer:

1,6

Step-by-step explanation:

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4 years ago

John swims 2.5 miles and sees a total of 12 fishes if he swims 8 miles how many fish will he see

Zolol [24]

Answer:

Step-by-step explanation:

2.5 miles = 12 fishes

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1 year ago

P= -4b^2+6b-9<br> Q= 7b^2-2b-5<br> P-Q=

insens350 [35]

Answer:

P - Q = - 11b² + 8b - 4

Step-by-step explanation:

P - Q

= - 4b² + 6b - 9 - (7b² - 2b - 5) ← distribute parenthesis by - 1

= - 4b² + 6b - 9 - 7b² + 2b + 5 ← collect like terms

= - 11b² + 8b - 4

5 0

3 years ago

Show that ( 2xy4 + 1/ (x + y2) ) dx + ( 4x2 y3 + 2y/ (x + y2) ) dy = 0 is exact, and find the solution. Find c if y(1) = 2.

fredd [130]

$\dfrac{\partial\left(2xy^4+\frac1{x+y^2}\right)}{\partial y}=8xy^3-\dfrac{2y}{(x+y^2)^2}$

$\dfrac{\partial\left(4x^2y^3+\frac{2y}{x+y^2}\right)}{\partial x}=8xy^3-\dfrac{2y}{(x+y^2)^2}$

so the ODE is indeed exact and there is a solution of the form $F(x,y)=C$ . We have

$\dfrac{\partial F}{\partial x}=2xy^4+\dfrac1{x+y^2}\implies F(x,y)=x^2y^4+\ln(x+y^2)+f(y)$

$\dfrac{\partial F}{\partial y}=4x^2y^3+\dfrac{2y}{x+y^2}=4x^2y^3+\dfrac{2y}{x+y^2}+f'(y)$

$f'(y)=0\implies f(y)=C$

$\implies F(x,y)=x^2y^3+\ln(x+y^2)=C$

With $y(1)=2$ , we have

$8+\ln9=C$

$\boxed{x^2y^3+\ln(x+y^2)=8+\ln9}$

8 0

3 years ago