All categories

3 years ago

Which of the following represents the most accurate estimation of 30 - 18?

Mathematics

1 answer:

NISA [10]3 years ago

4 0

Which of the following represents the most accurate estimation of 30-18

You might be interested in

Can someone help please

Margaret [11]

9. Area of a triangle is proportional to height. If the height increases by a factor of 4, then ...
The area will increase by a factor of 4. . . . . (2nd selection)

10. The base lengths and height are needed:
• 5 mm
• 8 mm
• 10 mm

7 0

3 years ago

The sum of two numbers is ten. the difference between them is 8 . find the two numbers

alexira [117]

x+y=10

x-y=8, x=y+8

y+8+y=10

2y=2

y=1

So, x=10-y=10-1=9.

Numbers Would be 9 and 1.

3 0

3 years ago

8x + 12 = 4r - 16 find r

Ber [7]

After r duhh IM SORRY

7 0

3 years ago

Read 2 more answers

D^2(y)/(dx^2)-16*k*y=9.6e^(4x) + 30e^x

MA_775_DIABLO [31]

The solution depends on the value of $k$ . To make things simple, assume $k>0$ . The homogeneous part of the equation is

$\dfrac{\mathrm d^2y}{\mathrm dx^2}-16ky=0$

and has characteristic equation

$r^2-16k=0\implies r=\pm4\sqrt k$

which admits the characteristic solution $y_c=C_1e^{-4\sqrt kx}+C_2e^{4\sqrt kx}$ .

For the solution to the nonhomogeneous equation, a reasonable guess for the particular solution might be $y_p=ae^{4x}+be^x$ . Then

$\dfrac{\mathrm d^2y_p}{\mathrm dx^2}=16ae^{4x}+be^x$

So you have

$16ae^{4x}+be^x-16k(ae^{4x}+be^x)=9.6e^{4x}+30e^x$
$(16a-16ka)e^{4x}+(b-16kb)e^x=9.6e^{4x}+30e^x$

This means

$16a(1-k)=9.6\implies a=\dfrac3{5(1-k)}$
$b(1-16k)=30\implies b=\dfrac{30}{1-16k}$

and so the general solution would be

$y=C_1e^{-4\sqrt kx}+C_2e^{4\sqrt kx}+\dfrac3{5(1-k)}e^{4x}+\dfrac{30}{1-16k}e^x$

8 0

3 years ago

If u add 5 to me and then divide by 9,u get 3. What number amI?

STatiana [176]

You are 22. If you add 22+5 you get 27. And if you divide 27 by 9 you get 3. So it is 22

6 0

3 years ago

Read 2 more answers