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3 years ago

7

Round 2.372 to the nearest tenth

1 answer:

creativ13 [48]3 years ago

8 0

There is no ones place after the decimal so 3 is in the tenth place, so 2.4

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A solid concrete wall 4.0 m by 2.4 m and 30 cm thick, with a thermal conductivity of 1.3 w/(m·k), separates a basement at 18°c f

Nastasia [14]

<span>THE AREA OF THE ROOM IS :A=4*2.4=9.6 m^2
THICKNESS t=0.30 m
DIFFERENCE IN TEMPERATURE dT=18-6=12
q=kAdT/dx=kA*dT/t
q=1.3(9.6)(12)/0.30=4992 W=499.2 J/s
In 1 hour or 3600 sec
P=q*T=(499.2 J/s)(3600 s)=1797120 J=1.8 MJ
1.8MJ OF HEAT FLOWS HTROUGH THE WALL IN ONE HOUR</span>

5 0

3 years ago

What is the value of x?

Vinil7 [7]

x=21

x-4 + 3x +100=180

x + 3x =84(180-100-4)

4x=84

x=21

x-4=17

3x21=63

100+21+63=180

6 0

3 years ago

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Mark rolls a fair dice 36 times. How many times would Mark expect to roll a number greater than 5?

DochEvi [55]

Answer:

Let X be the number of times a Dice rolls 4.

Expected value is 96/6 = 16.

Step-by-step explanation:

4 0

3 years ago

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7x - 12y = 180<br> 7x = 84

Advocard [28]

Answer:

(12,--8) or x=12, y=-8

Step-by-step explanation:

3 0

3 years ago

Find the x-intercepts of the parabola with

tia_tia [17]

Answer:

$(\frac{1}{2},0),(\frac{3}{2},0)$

Step-by-step explanation:

The vertex form of a parabola is given by:

$y=a(x-h)^2+k$ , where V(h,k) is the vertex of the parabola.

The given parabola has vertex (1,1).

This implies that: $h=1,k=1$ .

Put these values into the vertex form equation.

$\implies y=a(x-1)^2+1$

The y-intercept of this parabola is: (0,-3).

This point lies on the parabola hence it must satisfy its equation.

$\implies -3=a(0-1)^2+1$

$\implies -3=a(-1)^2+1$

$\implies -3=a(1)+1$

$\implies -3=a+1$

$\implies -3-1=a$

$\implies -4=a$

The equation now becomes

$\implies y=-4(x-1)^2+1$

To find the x-intercept, put y=0 into the equation:

$\implies -4(x-1)^2+1=0$

$\implies -4(x-1)^2=-1$

Divide through by -4.

$\implies \frac{-4(x-1)^2}{-4}=\frac{-1}{-4}$

$\implies (x-1)^2=\frac{-1}{-4}$

$\implies (x-1)^2=\frac{1}{4}$

Take plus or minus square root of both sides.

$\implies x-1=\pm \sqrt{\frac{1}{4}}$

$\implies x-1=\pm \frac{1}{2}$

$\implies x=1\pm \frac{1}{2}$

$\implies x=1-\frac{1}{2}$ or $\implies x=1+ \frac{1}{2}$

$\implies x=\frac{1}{2}$ or $\implies x=1 \frac{1}{2}$

Therefore the x-intercepts are:

$(\frac{1}{2},0),(\frac{3}{2},0)$

To the nearest hundredth, we have $0.50,0),(1.50,0)$

7 0

4 years ago