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3 years ago

The height of a ball kicked into the air from

Mathematics

1 answer:

aniked [119]3 years ago

6 0

Answer:

Quadratic equation ax%5E2%2Bbx%2Bc=0 (in our case -16x%5E2%2B45x%2B-3+=+0) has the following solutons:

x%5B12%5D+=+%28b%2B-sqrt%28+b%5E2-4ac+%29%29%2F2%5Ca

Step-by-step explanation:

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3x-6y=15 -3x-9y=-30 Please help!! Its due in 30 minutes!!

olchik [2.2K]

Step-by-step explanation:

Refer to the attachment.

I hope it helps:)

3 0

2 years ago

Assume you have such a watch. if a minimum of 18.0% of the original tritium is needed to read the dial in dark places, for how m

laila [671]

Given that the half life of 3H is 12.3 years.

The amount of substance left of a radioactive substance with half life of $t_{ \frac{1}{2} }$ after t years is given by

$N(t)=N_0\left(\frac{1}{2} \right)^{ \frac{t}{t_{\frac{1}{2}} }$

Therefore, the number of years it will take for 18% of the original tritinum to remain is given by

$18 \% = 100 \% \left(\frac{1}{2} \right)^{ \frac{t}{12.3}} \\ \\ \Rightarrow\left(\frac{1}{2} \right)^{ \frac{t}{12.3}} =0.18 \\ \\ \Rightarrow\frac{t}{12.3}\ln\left(\frac{1}{2} \right)=\ln0.18 \\ \\ \Rightarrow\frac{t}{12.3}= \frac{\ln0.18}{\ln\left(\frac{1}{2} \right)} = \frac{-1.715}{-0.6931} =2.474\\ \\ \Rightarrow t=2.474(12.3)=30.4$

Therefore, the number of years that the time could be read at night is 30.4 years.

5 0

3 years ago

The formula for the circumference of a circle is C = 2 pi r. Determine the circumference when the radius r is 10 cm.

liq [111]

Answer:

D 100cm

Step-by-step explanation:

6 0

3 years ago

Annie have 56 stamps that are 26 less than one half of my stamps how many stamps do i have？

Ksivusya [100]

Answer:

You have 164 stamps.

Step-by-step explanation:

Let the no. of my stamps be 'x'

Half of x subtracted by 26 = 56

$\frac{1}{2} x$ - 26 = 56

$\frac{1}{2} x$ = 56 + 26 = 82

$x$ = 82 x 2 = 164

Let's check

$\frac{164}{2}$ - 26 = 56

$\frac{164}{2}$ = 56 + 26

164 = 82 x 2

164 = 164!

The answer is correct.

6 0

2 years ago

If a- b= 2 and ab= 15 then a3-b3? a) 30 b) 98 c) 20 d) 60 full explanation please

krek1111 [17]

Answer:

C) 20

Step-by-step explanation:

ab=15

5*3 = 15

which is a and which is b

a - b = +2

5 - 3 = + 2

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

a = 5 and

b = 3

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

a3-b3 = 53 - 33 = 20

7 0

2 years ago

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