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3 years ago

7

Please help (algebra)

1 answer:

Serggg [28]3 years ago

7 0

Answer:

0.1

Step-by-step explanation:

0.3 x 7= 2.1

2.1 - 2= 0.1

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Which is bigger 7/8 or 0.78

agasfer [191]

<span>7/8 = 7 * 1/8 and 1/8 = 1 : 8 = 0.125. After that: 7 * 0.125 = 0.875. Finally, 0.875 > 0.78. We can do it also by transforming 0.78 to fraction: 0.78 = 78/100 = 39/50 and then multiplying the numerator and the denominator by 4: 39/50 = 156 / 200 . Then we will also multiply 7/8 * 25/25 = 175/ 200. Obviously: 175/200 > 156/200. Answer: 7/8 is bigger than 0.78. </span>

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3 years ago

How many seconds are in 7 minutes?(feel free to show your work :)

Bumek [7]

Answer:

420 seconds

Step-by-step explanation:

60 seconds are in 1 minute

60 x 7 = 420

therefore there are 420 seconds in 7 minutes

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3 years ago

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Find the radius of a circle if a 48-meter chord is 7 meters from the center. *

Airida [17]

Answer:

The radius of the circle is 25m

Step-by-step explanation:

Here, we are to calculate the radius of the circle.

The distance from the circle center, the half the length of the chord and the radius forms a right triangle with the radius being the hypotenuse.

We can then use Pythagoras’s theorem to approximate the value of the radius

Mathematically, the Pythagorean theorem establishes that the square of the hypotenuse = the sum of the squares of the other two sides

r^2 = 7^2 + 24^2

r^2 = 49 + 576

r^2 = 625

r = √(625)

r = 25m

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3 years ago

Which expression is a factor of 10x2 + 11x + 3?

Paraphin [41]

2x+1.....i think,let me know

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4 years ago

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A Super Happy Fun Ball is dropped from a height of 4 feet and rebounds 4 5 of the distance from which it fell. How many times wi

viva [34]

Answer:

More than 6.21 times

Step-by-step explanation:

The common ratio $r=\dfrac{4}{5}$

Distance of first bounce

$a_1=4\times \dfrac{4}{5}=\dfrac{16}{5}$

Second bounce

$a_2=ar^{n-1}=\dfrac{16}{5}(\dfrac{4}{5})^{2-1}\\\Rightarrow a_2=\dfrac{16}{5}(\dfrac{4}{5})$

n bounce

$a_n=ar^{n-1}\\\Rightarrow a_n=\dfrac{16}{5}(\dfrac{4}{5})^{n-1}$

Now the nth bounce will be less than 1 feet

$\dfrac{16}{5}(\dfrac{4}{5})^{n-1}$

Applying logarithms on both sides we get

$(n-1)\ln \dfrac{4}{5}\dfrac{\ln\dfrac{5}{16}}{\ln \dfrac{4}{5}}+1$

The inequality changes as both $\ln\dfrac{5}{16}$ and $\ln \dfrac{4}{5}$ are negative numbers.

So,

$n>6.21$

Hence, the number of bounces is more than 6.21 times.

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3 years ago