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allochka39001 [22]
3 years ago
7

A certain fraction has a value of 15. the denominator is four more than three times the numerator. what is the fraction?

Mathematics
1 answer:
ra1l [238]3 years ago
3 0
N/d = 15
d= 4 + 3n

d=n/15
n/15=4+3n
n=60+45n
44n=-60
n=-15/11
-15/11 / d = 15
-15/11 = 15d
d=-1/11

15/11 / 1/11. = 15
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n200080 [17]

Answer:

32.5

Step-by-step explanation:

7h+1.50d

step 2: plug in the hours he worked and the amount of deliveries made.

(7x4)+(1.50x3)=32.5

3 0
2 years ago
To obtain information on the corrosion-resistance properties of a certain type of steel conduit, 45 specimens are buried in soil
Fiesta28 [93]

Answer:

The sample has not met the required specification.

Step-by-step explanation:

As the average of the sample suggests that the true average penetration of the sample could be greater than the 50 mils established, we formulate our hypothesis as follow

H_0: The true average penetration is 50 mils

H_a: The true average penetration is > 50 mils

Since we are trying to see if the true average is greater than 50, this is a right-tailed test.

If the <em>level of confidence</em> is α = 0.05 then the z_\alpha score against we are comparing with, is 1.64 (this is because the area under the normal curve N(0;1) to the right of 1.64 is 0.05)

The z-score associated with this test is

z=\frac{\bar x-\mu}{s/\sqrt{n}}

where

\bar x = <em>mean of the sample</em>

\mu = <em>average established by the specification</em>

s = <em>standard deviation of the sample</em>

n = <em>size of the sample</em>

Computing this value of z we get z = 3.42

Since z >z_\alpha we can conclude that the sample has not met the required specification.

5 0
3 years ago
In a lottery, 5000 tickets are sold for $1 each, one first prize of $2000, 1 second prize of $500, 3 third prizes of $100, and 1
RSB [31]
There is 1/5000 chance to win first place of $2000,
1/5000 chance to win second place of $500
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We multiply each probability by the amount, and subtract the ticket cost, to get the expected net earnings:
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4 0
3 years ago
The present age of reshmas father is three times her present age after five years the sum of their age will be 70 find their pre
iren [92.7K]
Reshma's age = x

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x + 5 + 3x + 5 = 70
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So Reshma's age currently is 15 and 3(15), which is 45, is her father's age.
8 0
3 years ago
Please help this is my last hope
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Try using the equation v= pi(r)^2
6 0
2 years ago
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