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4 years ago

How many significant figures are in the measured value 550,000,000?

1 answer:

5 0

There are 2 significant figures (sig figs) which are the two '5' digits. The zeros aren't considered sig figs because we can write the number as 5.5 * 10^8 to represent the exact same idea. The 0's are simply placeholders to tell how big the number is, not necessarily how accurate it is. If the 0s were between the decimal point and a nonzero value, then the 0s would be significant. If the 0s were to the right of the decimal, then they would be significant.

Answer: 2

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Simplify the radical expression.. square root of 128

Vaselesa [24]

Hello,

first we have to descompose the number:

128 | 2
64 | 2
32 | 2
16 | 2
8 | 2
4 | 2
2 | 2
1

So:
$128= 2x2x2x2x2x2x2 \\ 128=2^{6} *2$

Therefore:
$\sqrt{128}= \sqrt{2^{6} *2}$

You must know these properties:

$\sqrt{a*b} = \sqrt{a} * \sqrt{b}\\ \\ \sqrt[b]{x^a}= x^{ \frac{a}{b}}$

then:

$\sqrt{2^{6} *2} \\ =\sqrt{2^{6}}*\sqrt{2} \\ =2^{ \frac{6}{2}}*\sqrt{2} \\ =2^3*\sqrt{2} \\ \boxed{=8*\sqrt{2}}$

6 0

4 years ago

2/5+3/7 is the same as?

Vsevolod [243]

Answer:

29/35

Step-by-step explanation:

Least common denominator of 5 and 7 is 35

$\frac{2}{5}=\frac{2*7}{5*7}=\frac{14}{35}\\\\\frac{3}{7}=\frac{3*5}{7*5}=\frac{15}{35}\\\\\frac{2}{5}+\frac{3}{7}=\frac{14}{35}+\frac{15}{35}\\\\ \ = \frac{14+15}{35}\\\\ = \frac{29}{35}$

6 0

3 years ago

A cylinder has a volume of 140 cubic meters and a heigth of 14 meters.What is the area of the base?

muminat

Answer:

10 square meters

Step-by-step explanation:

You can find the volume of a cylinder by multiplying the area of its base by its height. This can be shown by the equation: v = (pi(r^2))h, or 140 = 14x

If you divide 140 by 14, you can get the area of its base.

6 0

3 years ago

Please assist me with this

svp [43]

Answer:

<h2>The answer is option A</h2>

Step-by-step explanation:

To find the value of x when y = 24, we must first find the relationship between them

<h3> $y \: \: \alpha \: \: \frac{k}{ \sqrt{x} }$ </h3>

where k is the constant of proportionality

when

x = 16

y = 2

Substitute the values into the above formula and solve for k

That's

Cross multiply we have the answer as

k = 8

So the formula for the variation is

Now when y = 24

We have

Square both sides

We have the final answer as

Hope this helps you

5 0

3 years ago

If 3t - 7 =5t, then 6t =

Orlov [11]

Step-by-step explanation:

$3t - 7 = 5t \\ \\ \therefore \: 3t - 5t = 7 \\ \\ \therefore \: - 2t = 7 \\ \\ \therefore \: t = \frac{7}{ - 2} \\ \\ \therefore \: t = - 3.5 \\ \\ \implies \: 6t = 6 \times ( - 3.5) = - 21$

5 0

4 years ago

Read 2 more answers