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tamaranim1 [39]
2 years ago
11

Simplify the complex fraction: 4/(x+3)/(1/x+3)

Mathematics
2 answers:
sertanlavr [38]2 years ago
7 0

Answer:

4

Step-by-step explanation:

To simplify

\frac{4}{x+3} ÷ \frac{1}{x+3}

Change division to multiplication and turn the second fraction upside down, that is

\frac{4}{x+3} × \frac{x+3}{1}

Cancel the factor (x + 3) on the numerator/ denominator , leaving

\frac{4}{1} = 4

Alexandra [31]2 years ago
7 0

Answer:

The answer is 4, because the (x+3) cancels out.

Step-by-step explanation:

4/(x+3) / (1/x+3) =

The numerator will be multiplied by the inverse of the denominator:

4/(x+3) * (x+3)/1 =

Cross out the (x+3) in the numerator and the denominator.

What remains is:

4 / 1 = 4

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A 15 kilogram object is suspended from the end of a vertically hanging spring stretches the spring 1/3 meters. At time t = 0, th
Yuri [45]

Answer:

15\frac{d^{2}y(t)}{dt^{2} }  - 441.45y(t) = ± 170 cos(5t)

y(0)=0, y'(0)=0

Step-by-step explanation:

See the attached image

This problem involves Newton's 2nd Law which is: ∑F = ma, we have that the acting forces on the mass-spring system are: F_{r} (t) that correspond to the force of resistance on the mass by the action of the spring and F(t) that is an external force with unknown direction (that does not specify in the enounce).

For determinate F_{r} (t) we can use Hooke's Law given by the formula F_{r} (t) = k y(t) where k correspond to the elastic constant of the spring and y(t) correspond to  the relative displacement of the mass-spring system with respect of his rest state.

We know from the problem that an 15 Kg mass stretches the spring 1/3 m so we apply Hooke's law and obtain that...

k = \frac{F_{r}}{y} = \frac{mg}{y} = \frac{15 Kg (9.81 \frac{m}{s^{2} } )}{\frac{1}{3} m}  = 441.45 \frac{N}{m}

Now we apply Newton's 2nd Law and obtaint that...

F_{r} (t) ± F(t) = ma(t)

F_{r} (t) = ky(t) = 441.45y(t)

F(t) = 170 cos(5t)

m = 15 kg

a(t) = \frac{d^{2}y(t)}{dt^{2} }

Finally... 15\frac{d^{2}y(t)}{dt^{2} }  - 441.45y(t) = ± 170 cos(5t)

We know from the problem that there's not initial displacement and initial velocity, so... y(0)=0 and y'(0)=0

Finally the Initial Value Problem that models the situation describe by the problem is

\left \{ 15\frac{d^{2}y(t)}{dt^{2} }  - 441.45y(t) = \frac{+}{} 170 cos(5t) \atop {y(0)=0, y'(0)=0\right.

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5 inches by 7 inches.

To find the area of a parallelogram, you can just do base * height. In this case, all other options, once multiplied, equal 36 square inches, it's only 5 * 7 that equals 35 square inches.
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