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Reika [66]
3 years ago
9

7th grade math pls help

Mathematics
2 answers:
Advocard [28]3 years ago
7 0
The answer to the question is A.
cestrela7 [59]3 years ago
6 0

Answer:

A.

Step-by-step explanation:

The volume of rectangular prism is l x w x h

So, 12 x 6 x 8 =576

Volume of triangular prism is l x w /2 x h

So, 6x8=48/2= 24

24x12=288

576/288=2

This shows that the rectangular prism is 2 times larger than the triangular prism.

Therefore, the answer is A.

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What’s the slope of this
Andrews [41]
The slope of the line is 4/3
8 0
3 years ago
Determine whether the equation is exact. If it​ is, then solve it. e Superscript t Baseline (7 y minus 3 t )dt plus (2 plus 7 e
umka21 [38]

Answer:

F(t,y)=(2+7e^t)y+3(1-t)e^t +C

Step-by-step explanation:

You have the following differential equation:

e^t(7y-3t)dt+(2+7e^t)dy=0

This equation can be written as:

Mdt+Ndy=0

where

M=e^t(7y-3t)\\\\N=(2+7e^t)

If the differential equation is exact, it is necessary the following:

\frac{\partial M}{\partial y}=\frac{\partial N}{\partial t}

Then, you evaluate the partial derivatives:

\frac{\partial M}{\partial y}=\frac{\partial}{\partial t}e^t(7y-3t)\\\\\frac{\partial M}{\partial t}=7e^t\\\\\frac{\partial N}{\partial t}=\frac{\partial}{\partial t}(2+7e^t)\\\\\frac{\partial N}{\partial t}=7e^t\\\\\frac{\partial M}{\partial t} = \frac{\partial N}{\partial t}

The partial derivatives are equal, then, the differential equation is exact.

In order to obtain the solution of the equation you first integrate M or N:

F(t,y)=\int N \partial y = (2 +7e^t)y+g(t)        (1)

Next, you derive the last equation respect to t:

\frac{\partial F(t,y)}{\partial t}=7ye^t+g'(t)

however, the last derivative must be equal to M. From there you can calculate g(t):

\frac{\partial F(t,y)}{\partial t}=M=(7y-3t)e^t=7ye^t+g'(t)\\\\g'(t)=-3te^t\\\\g(t)=-3\int te^tdt=-3[te^t-\int e^tdt]=-3[te^t-e^t]

Hence, by replacing g(t) in the expression (1) for F(t,y) you obtain:

F(t,y)=(2+7e^t)y+3(1-t)e^t +C

where C is the constant of integration

8 0
4 years ago
Help- I'm in 6th and the homework is confusing-​
MaRussiya [10]

Answer: 9

Step-by-step explanation:

you just have to count the unshaded area that’s zoomed in!

4 0
3 years ago
Alexandra invests £885 into an account that pays 2.75% simple interest per year.
ipn [44]

Answer:

£389.4 (interest earned, not total amount of money in account)

Step-by-step explanation:

Interest = principal * rate * time (years)

I = 885 * 0.0275 * 16

I = 398.4

6 0
3 years ago
Simplify the expression -4x^2(3x − 7).
satela [25.4K]

Answer:

Step-by-step explanation:

Simplify the expression -4x^2(3x − 7).

A. -12x^3 + 28

<h2>B. -12x^3 + 28x^2<= your answer</h2>

C. -12x^3 − 28

D. -12x^3 − 28x^2

5 0
3 years ago
Read 2 more answers
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