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faust18 [17]
3 years ago
10

Find two numbers whose sum is 29 and whose difference is 15

Mathematics
1 answer:
gizmo_the_mogwai [7]3 years ago
4 0
The two numbers are 22 and 7.
22 + 7 = 29
22 - 7 = 15
here is how we can find these numbers;
let a and b are two numbers
a + b = 29
a - b = 15
a   = 15 + b
now put this value of a in any of the equation
a + b = 29
15 + b  + b = 29
15 + 2b = 29
2b = 29 - 15
2b = 14
b = 7
now put the value of b to find the value of a;
a = 15 + b = 15 + 7 = 22
a = 22
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A square pyramid has base edge length 6 ft. The slant height of the pyramid is 5 ft. What is the volume of the​ pyramid?
nadya68 [22]

Answer:

V = 60 m3

Step-by-step explanation:

Volume of a square pyramid:

V = (1/3)a2h

Slant Height of a square pyramid:

By the pythagorean theorem we know that

s2 = r2 + h2

since r = a/2

s2 = (1/4)a2 + h2, and

s = √(h2 + (1/4)a2)

This is also the height of a triangle side

6 0
3 years ago
Add the opposite number of 1 1/5 to the sum of the numbers (−8 3/4 ) and (−2 5/6 ). Answer:
masha68 [24]

Answer:

  -12 47/60

Step-by-step explanation:

-(1 1/5) + (-8 3/4 -2 5/6) = -(1 + 8 + 2 + 1/5 + 3/4 + 5/6)

= -(11 + 12/60 +45/60 +50/60) . . . 60 is the LCD of 1/5, 3/4, 5/6

= -(11 + 107/60) . . . . . . . . . . . . . . . . add the fractions

= -(12 47/60) = -12 47/60 . . . . . . . write as a mixed number

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Your graphing calculator may be able to do this for you. Many handle mixed numbers with ease.

4 0
3 years ago
Suppose a large shipment of compact discs contained 19% defectives. If a sample of size 343 is selected, what is the probability
Yuri [45]

Answer:

The value is  P( | \^p - p | <  0.04) = 0.9408

Step-by-step explanation:

From the question we are told that

    The population proportion is p =  0.19

   The sample size is n = 343

 Generally given that the ample size is large enough , i.e  n > 30 then the mean of this sampling distribution is mathematically represent

      \mu_{x} = p = 0.19

 Generally the standard deviation is mathematically represented as

      \sigma   =\sqrt{\frac{p(1- p)}{n} }

=>   \sigma   =\sqrt{\frac{0.19 (1- 0.19 )}{343 } }  

=>   \sigma   = 0.0212

Generally the the probability that the sample proportion will differ from the population proportion by less than 4% is mathematically represented as

        P( | \^p - p | <  0.04) = P( \frac{|\^ p - p |}{ \sigma_p } <  \frac{0.04}{0.0212 }  )

\frac{|\^ p - p |}{\sigma }  =  |Z| (The  \ standardized \  value\  of  \ |\^ p - p | )

     P( | \^p - p | <  0.04) = P( |Z| <  1.887   )

=>  P( | \^p - p | <  0.04) = P( Z <  1.887   )- P( Z <  -1.887   )

From the z table  the area under the normal curve to the left corresponding to  1.887  and  - 1.887  is

      P( Z <  1.887   )= 0.97042

and  

     P( Z <  -1.887   )= 0.02958

So

     P( | \^p - p | <  0.04) = 0.97042 - 0.02958

=>   P( | \^p - p | <  0.04) = 0.9408

3 0
2 years ago
A new car costs the purchase price, plus a 7.5% tax. The cost of the car can be written as x + 0.075x. Write an equivalent expre
mr Goodwill [35]

Answer:

Step-by-step explanation:

The cost = x * (1 + 0.075) = x * 1.075 = 1.075*x

3 0
3 years ago
Order in least to greatest<br><br> 179/25,7.72,7 3/25,7.723
Andru [333]
(3/25)(179/25)(7.72)(7.723) and if you add a zero at the end of 7.72 you get 7.720 and if you compare it to 7.723 you can see that it's less than 7.723 Hope it helps :D
5 0
3 years ago
Read 2 more answers
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