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3 years ago

Please help with this!!!

Mathematics

1 answer:

iris [78.8K]3 years ago

7 0

Answer: The y values remain the same, but the x value changes its sign

Step-by-step explanation: There is a way to remember this. If you reflect across the y axis the y will stay the same and, if you reflect across the x axis the x will stay the same. So if the axis is in the problem then that axis will stay the same and the other axis will change to its opposite.

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What's the perimeter of the wall hanging to the nearest tenth of a centimeter

Temka [501]

You just add the LxW and for area you multiply LxWxLxW

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4 years ago

Find the solution to the differential equation dz/dt = 7te^4z that passes through the origin.

andreev551 [17]

Answer:

$z=(\frac{-1}{4} )ln|1-14t^{2}|\\$

Step-by-step explanation:

from the equation, $\frac{dz}{dt}=7te^{4z}\\$ .

we can give different approach to the equation, but to make it simple and direct, let separate the equation by bringing all like terms to the same side i.e

$\frac{dz}{e^{4z}}=7tdt\\e^{-4z} dz=7tdt$ .

if we integrate both side,

$\int\limits^a_b{e^{-4z} } \,dz =\int\limits^a_b {7t} \,dt$

$-1/4e^{-4z} +c_{1}=7/2t^{2} +c_{2}\\-1/4e^{-4z}= 7/2t^{2} +c_{2}-c_{1}\\let c_{2}-c_{1}=c \\-1/4e^{-4z}= 7/2t^{2} +c$

since the equation passes through the origin, and at the origin z=0 and t=0

we substitute this values and solve for the constant c

$e^{-4*0}= 7/2*0 +c\\c=1$ .

If we substitute the value of c into the equation we arrive at

$(-1/4)e^{-4z}= (7/2)t^{2}+1\\ e^{-4z}=1-14t^{2} \\$

if we the the natural logarithm of both sides, we arrive at

$-4z=ln|1-14t^{2}|\\z=(\frac{-1}{4} )ln|1-14t^{2}|\\$

3 0

3 years ago

ASAP SERIOUSLY PLEASE HELP IVE ASKED THIS QUESTION SO MANY TIMES NO ONE IS ANSWERING

Bess [88]

Answer:

Step-by-step explanation:

For Perimeter, just times both sides by 2 then add those together:

2(5x+2) + 2(3x+8) = 10x +4 +6x +16 = 16x + 20

If they want a solid #:

16x/16 = -20/16

x = -5/4

16(-5/4) + 20

-20 + 20 = 0

However, I think the first answer would the most likely

For Area, multipy the 2 sides using the box method, foil, etc.

I like using the box method (see image)

For the rest, its basically the same thing. The triangle is just adding the sides together

Hope this help! -w-

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3 years ago

tasha wants to find the quotient of 1026 divided 27. she creates a table to show the products of 27 multiplied by different muli

ivanzaharov [21]

1026/27=38
She will try to multiply 27 with 10 then 20 then 30 then 40 and then she will see it’s close to 40 so she’ll know it must be between 30 a de 40 but closer to 40

7 0

3 years ago

MATH SMARTIES PLEASE HELP!! I WILL GIVE BRAINLIEST

lutik1710 [3]

Answer:

Step-by-step explanation:

fraction decimal percent

1/4 .25 25%

3/10 .30 30%

1/5 .20 20%

3/4 .75 75%

1/2 .5 50%

4 0

3 years ago

Read 2 more answers