All categories

3 years ago

Help me with the question A and B please urgent...

Mathematics

2 answers:

ankoles [38]3 years ago

8 0

The perimeter of an object is all of its sides added up. So it gives you the length and widths of the shape.
A. X + 4 + X + X + 4 + X = 34. But we can simply that even further. To 4X + 8 = 34

B. So solve that you would first Subtract 8 from each side. You then get 4x = 26
X = 13/2
13/2 is your answer. You can simplify this to 7.5 but ask your teacher if you can leave it as 13/2 because it will save you a lot of time on a test.

vampirchik [111]3 years ago

7 0

A: 34-8 = 26/4 = 6.5 so x=6.5

You might be interested in

Help for just 100 points!

34kurt

The answer is C

the mean is the average which is solved by adding up all of the numbers and then dividing that by how many numbers there are, 45/5 = 9

6 0

2 years ago

Read 2 more answers

42.5% of what is 20.57

babunello [35]

42.5% of what = 20.57

42.5% of x = 20.57

(42.5/100)*x = 20.57

42.5x / 100 = 20.57

x = 20.57 * 100 / 42.5

x = 48.4

Therefore 42.5% of 48.4 is 20.57.

7 0

3 years ago

Read 2 more answers

A construction crew needs to close 75% of a 5-mile road while they do construction. How much of the road is closed,

gulaghasi [49]

Answer:

Step-by-step explanation:

I did .75 x 5 to get 75% of the road. I then converted the amount into kilometers using a reliable converter. I got 6 kilometers then.

4 0

3 years ago

Kevin and randy my use have a jar containing 64 coins all of which are either quarters or nickels. The total value of the coins

guapka [62]

They have 24 quarters and couple nickels

7 0

3 years ago

The 20 to 34 age groups are approximately normally distributed with µ = 110

Savatey [412]

Answer:

21.94% of people aged 20 to 34 have IQs between 125 and 150.

Step-by-step explanation:

The complete question is: Scores on the Wechsler Adult Intelligence Scale (a standard IQ test) for the 20 to 34 age group are approximately Normally distributed with μ = 110 and σ = 25.

What percent of people aged 20 to 34 have IQs between 125 and 150?

Let X = Scores on the standard IQ test for the 20 to 34 age group

SO, X ~ Normal( $\mu=110,\sigma^{2} =25^{2}$ )

The z-score probability distribution for the normal distribution is given by;

Z = $\frac{X-\mu}{\sigma}$ ~ N(0,1)

where, $\mu$ = population mean = 110

$\sigma$ = standard deviation = 25

Now, the percent of people aged 20 to 34 have IQs between 125 and 150 is given by = P(125 < X < 150) = P(X < 150) - P(X $\leq$ 125)

P(X < 150) = P( $\frac{X-\mu}{\sigma}$ < $\frac{150-110}{25}$ ) = P(Z < 1.60) = 0.9452

P(X $\leq$ 125) = P( $\frac{X-\mu}{\sigma}$ $\leq$ $\frac{125-110}{25}$ ) = P(Z $\leq$ 0.60) = 0.7258

The above probability is calculated by looking at the value of x = 1.60 and x = 0.60 which has an area of 0.9452 and 0.7258.

Therefore, P(125 < X < 150) = 0.9452 - 0.7258 = 0.2194 or 21.94%

7 0

4 years ago