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Veseljchak [2.6K]

3 years ago

9

What is the best estimate for the product of 289 and 7

1 answer:

Monica [59]3 years ago

6 0

If you round up it would be (300 x 10)= 2100

Between 1,400 and 2,100

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In a glide reflection, what comes first and what comes second?

NISA [10]

Answer:

A glide reflection is a composition of transformations.In a glide reflection, a translation is first performed on the figure, then it is reflected over a line. Therefore, the only required information is the translation rule and a line to reflect over. ... The first one is a translation rule.

3 0

2 years ago

I’m hoping I did this one right

drek231 [11]

The answer actually is 4,245 BUT that is the correct way to do it because you take the smaller population away from the larger population in order to find their difference in sizes.

8 0

2 years ago

What is 3÷34<br><br> A. 2.25<br> B. 3<br> C. 4<br> D. 12

harina [27]

Answer:

I think it is 12

(D)

6 0

2 years ago

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The gas law for an ideal gas at absolute temperature T (in kelvins), pressure P (in atmospheres), and volume V (in liters) is PV

JulijaS [17]

Answer:

$\frac{dT}{dt}=3.78^{\circ}K/min$

Step-by-step explanation:

We have to calculate the time derivative of T=PV/nR with P and V variable and n and R constants. This is:

$\frac{dT}{dt} =\frac{d\frac{PV}{nR}}{dt}=\frac{1}{nR}\frac{d(PV)}{dt}$

What we have to do is the derivative of a product:

$\frac{d(PV)}{dt}=P\frac{dV}{dt}+V\frac{dP}{dt}$

Substituting, we have:

$\frac{dT}{dt} =\frac{P\frac{dV}{dt}+V\frac{dP}{dt}}{nR}$

where all these values are given since the time derivatives of P and V are their variation rate, using minutes.

We then substitute everything, noticing that already everything is in the same system of units so they cancel out:

$\frac{dT}{dt}=\frac{P\frac{dV}{dt}+V\frac{dP}{dt}}{nR}=\frac{(8atm)(0.16L/min)+(13L)(0.14atm/min)}{(10mol)(0.0821Latm/mol^{\circ}K)}$

And then just calculate:

$\frac{dT}{dt}=3.78^{\circ}K/min$

6 0

2 years ago

WILL MARK AS BRAINIEST!!!!!!! In this triangle, which of the following is true?

prisoha [69]

Answer:

D

Step-by-step explanation:

The sum of the 3 angles in a triangle = 180°

Subtract the sum of the 2 given angles from 180

x = 180° - (90 + 35)° = 180° - 125° = 55°

----------------------------------------------------------

Since the triangle is right use the cosine ratio to solve for b

cos35° = $\frac{adjacent}{hypotenuse}$ = $\frac{b}{20}$

Multiply both sides by 20

20 × cos35° = b, hence

b = 16.38 ( to 2 dec. places )

7 0

2 years ago

Read 2 more answers