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iren [92.7K]
4 years ago
15

10.

Mathematics
2 answers:
Crank4 years ago
5 0
7.5 × 10-4

That's the scientific notation answer ^
Nesterboy [21]4 years ago
4 0
The answer for this question is 7.5 times 10 -4
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Posting a screenshot, help pls.
Nikolay [14]
When h=0, that is when it hits the ground

0=70-4t-16t²
based on your previous questions, you should have learned how to complete the square

solve by copmleting the square

minus 70 both sides
-70=-4t-16t²
times both sides by -1
70=4t+16t²
16t²+4t=70
divide both sides by 16
t²+1/4t=35/8
take 1/2 of the linear coefint and square it
half of 1/4=1/8, (1/8)²=1/64
add that to both sides
t²+1/4t+1/64=35/8+1/64
factor perfect square trionomial
(t+\frac{1}{8})^2=\frac{35}{8}+\frac{1}{64}
(t+\frac{1}{8})^2=\frac{280}{64}+\frac{1}{64}
(t+\frac{1}{8})^2=\frac{281}{64}
square root both sides, remember to take positive and negative roots
t+\frac{1}{8}=\frac{+/-\sqrt{281}}{8}
minus 1/8
t=\frac{-1+/-\sqrt{281}}{8}

t=\frac{-1+\sqrt{281}}{8} or t=\frac{-1-\sqrt{281}}{8}
the 2nd solution is not valid because that gives us a negative time, before the ball was dropped

so t=\frac{-1+\sqrt{281}}{8} is the solution
t≈1.97

1.97 seconds
7 0
4 years ago
I need help with this math question pretty please
AleksAgata [21]
Just do 11x18x20x14 and u should get it
3 0
3 years ago
Read 2 more answers
What is the factored form of the following expressions?<br><br> d^2 + 2d – 48
Andreas93 [3]

Answer:

(d-6)  (d+8)

Step-by-step explanation:

d^2 + 2d – 48

What two numbers multiply to -48 and add to 2

-6 * 8 = -48

-6+8 = 2

(d-6)  (d+8)

4 0
3 years ago
Which expression is equivalent to-8x-1y-9/-15x5y-3?
Vladimir79 [104]

Answer:

Yuhh the answers c dawhggg trus me i just did the same thing lawl!

Step-by-step explanation:

4 0
3 years ago
2. The mean birth weight of a full term boy born in the US is 7.7 lbs, with standard deviation of 1.1 lbs. A. Find the probabili
Fed [463]

Answer:

A

The value is P( X  <  7 ) =0.26226

B

The value is P( X  <  7 ) = 0.00073

Step-by-step explanation:

From the question we are told that

  The population mean is  \mu = 7.7 lbs

   The standard deviation is \sigma  = 1.1 \ lbs

  The sample size is  n =  25

Generally the probability that a boy born full term in the US weighs less than 7 lbs is mathematically represented as

     P( X  <  7 ) =  P( \frac{X - \mu }{\sigma}  <  \frac{7 - 7.7 }{1.1 } )

\frac{X -\mu}{\sigma }  =  Z (The  \ standardized \  value\  of  \ X )

=>   P( X  <  7 ) =  P(Z

From the z table  the area under the normal curve to the left corresponding to    -0.6364  is

    P(Z

=>   P( X  <  7 ) =0.26226

Generally the standard error of mean is mathematically represented as  

       \sigma_{x} = \frac{\sigma }{\sqrt{n} }

=>     \sigma_{x} = \frac{ 1.1  }{\sqrt{25} }

=>     \sigma_{x} = 0.22

Generally the probability that the average weight of 25 baby boys born in a particular hospital have an average weight less than 7 lbs is mathematically represented as

         P( \= X  <  7 ) =  P( \frac{\= X - \mu }{\sigma_{x}}  <  \frac{7 - 7.7 }{ 0.22 } )

=>      P( X  <  7 ) =  P(Z

From the z table  the area under the normal curve to the left corresponding to    -3.1818  is

=>      P(Z

=>      P( X  <  7 ) = 0.00073

4 0
3 years ago
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