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Ahat [919]
3 years ago
8

How to solve 8x + 7= 31 step by step

Mathematics
2 answers:
iren [92.7K]3 years ago
4 0

Answer:

x = 3

Step-by-step explanation:

Step 1: Equation

8x + 7 = 31

Step 2: Subtract on both sides

8x = 24

Step 3: Divide

x = 3

Answer:

x = 3

Hope This Helps :)

Masteriza [31]3 years ago
3 0

Answer:

3

Step-by-step explanation:

8x + 7 = 31                      Subtract 7 from both sides

  <u>   -7      -7</u>

8x =       24                    Divide by 8

8x/8  =   24/8

x = 3

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The junior and senior classes at Central High School were asked to choose a destination for a field trip. The results are shown
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Solution:

We are given below frequency table:

             Amusement-Park      Museum         Broadway-Show         Total

Juniors                57                      21                      42                          120

Seniors                64                     44                      58                          166

Total                    121                     65                      100                        286

We have to find the percentage of surveyed students who chose the amusement park.

From the table, we see there are total 121 students who chose amusement park out of total 286 students.

Therefore, the percentage of surveyed students who chose the amusement park is given below:

\frac{121}{286}\times 100=42.3\%

Hence, the option A. 42.30% correct.


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3 years ago
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A 2.2 kg ball strikes a wall with a velocity of 7.4 m/s to the left. The ball bounces off with a velocity of 6.2 m/s to the righ
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Answer:

The constant force exerted on the ball by the wall is 119.68 N.

Step-by-step explanation:

Consider the provided information.

It is given that the mass of the ball is m = 2.2 kg

The initial velocity of the ball towards left is 7.4 m/s

So the momentum of the ball when it strikes is = 2.2\times 7.4=16.28

The final velocity of the ball is -6.2 m/s

So the momentum of the ball when it strikes back is = 2.2\times -6.2=-13.64

Thus change in moment is: 16.28-(-13.64)=29.92

The duration of force exerted on the ball t = 0.25 s

Therefore, the constant force exerted on the ball by the wall is:

\frac{29.92}{0.25}=119.68

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The centers for disease control and prevention reported that 25% of baby boys 6-8 months old in the united states weigh more tha
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Answer:

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Step-by-step explanation:

Let X represents the event of weighing more than 20 pounds,

Since, the binomial distribution formula is,

P(x)=^nC_r p^r q^{n-r}

Where, ^nC_r=\frac{n!}{r!(n-r)!}

Given,

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=(0.75)^{16}+16(0.25)(0.75)^{15}+120(0.25)^2(0.75)^{14}

=0.1971110499

\approx 0.1971

3 0
3 years ago
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