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PtichkaEL [24]
2 years ago
13

The sum of two numbers is 167. The second number is 29 less than three times the first number. Fine the numbers. The two require

d numbers are:
Mathematics
2 answers:
dimaraw [331]2 years ago
6 0

Answer:

\Huge \boxed{\mathrm{49 \ and \ 118}}

Step-by-step explanation:

Let the first number be x

Let the second number be y

x+y=167

y=3x-29

Applying substitution method.

x+3x-29=167

Combining like terms.

4x-29=167

Adding 29 to both sides.

4x=196

Dividing both sides by 4.

x=49

Substituting x = 49 for the second equation.

y=3(49)-29

Multiplying the numbers.

y=147-29

Subtracting.

y=118

The two required numbers are 49 and 118.

Anettt [7]2 years ago
4 0

Answer:

49 and 118

Step-by-step explanation:

Let the two numbers be x and y

x+y = 167

y = 3x-29

Substitute into the first equation

x+ 3x-29 = 167

Combine like terms

4x - 29 = 167

add 29 to each side

4x = 167+29

4x = 196

Divide by 4

4x/4 = 196/4

x = 49

x+y = 167

49+y = 167

y = 167-49

y =118

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The correct answer would be C.
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8 0
3 years ago
The burning times of scented candles, in minutes, are normally distributed with a mean of 249 and a standard deviation of 20. Fi
Marysya12 [62]

Answer:

The candle burns for 244 minutes.

Step-by-step explanation:

When the distribution is normal, we use the z-score formula.

In a set with mean \mu and standard deviation \sigma, the zscore of a measure X is given by:

Z = \frac{X - \mu}{\sigma}

The Z-score measures how many standard deviations the measure is from the mean. After finding the Z-score, we look at the z-score table and find the p-value associated with this z-score. This p-value is the probability that the value of the measure is smaller than X, that is, the percentile of X. Subtracting 1 by the pvalue, we get the probability that the value of the measure is greater than X.

In this question, we have that:

\mu = 249, \sigma = 20

Find the number of minutes a scented candle burns if it burns for a shorter time than 60% of all scented candles.

This is the 100-60 = 40th percentile, which is X when Z has a pvalue of 0.4. So X when Z = -0.253.

Z = \frac{X - \mu}{\sigma}

-0.253 = \frac{X - 249}{20}

X - 249 = -0.253*20

X = 244

The candle burns for 244 minutes.

7 0
2 years ago
Can someone help!!!! Emergency!!!!
lions [1.4K]

Answer:

24

Step-by-step explanation:

4 0
3 years ago
Read 2 more answers
HELPEHEGEDHGDGXCCVCCXVV
ratelena [41]

Step-by-step explanation:

1) 7x+3y=19

2)2x-7y=12

3) x=5, y=0

4) x=15/2, y=(-63/4)

5) x=9, y=92

6) x=(-2) , y=(-9)

7) x=5, y=(-2)

8) x=2, y=2

3 0
2 years ago
13....................
Mashcka [7]

13.

(a)

y=-5x^2+21x-3

for x = 2:

y=-5(2)^2+21(2)-3=-20+42-3=19

for x = 5

y=-5(5)^2+21(5)-3=-125+105-3=-23

(b)

The graph is:

(c)

Using the graph:

\begin{gathered} x=1.8,y=18.6 \\ x=0.548,y=7 \\ x=3.65,y=7 \end{gathered}\begin{gathered} x=1.8 \\ y=-5(1.8)^2+21(1.8)-3=-16.2+37.8-3=18.6 \end{gathered}\begin{gathered} y=7 \\ -5x^2+21x-3=7 \\ -5x^2+21x-10=0 \end{gathered}

Using the quadratic formula:

\begin{gathered} x=\frac{-b\pm\sqrt[]{b^2-4ac}}{2a} \\ x=\frac{-21\pm\sqrt[]{21^2-4(-5)(-10)}}{2(-5)} \\ x=\frac{-21\pm\sqrt[]{241}}{-10} \\ x=0.54758 \\ or \\ x=3.6524 \end{gathered}

6 0
1 year ago
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