How do I solve this equation for x?

Mathematics

2 answers:

anygoal [31]3 years ago

7 0

Step 1: Simplify both sides of the equation.2(2x+12)(23)=3283x+16=32Step 2: Subtract 16 from both sides.83x+16−16=32−1683x=16Step 3: Multiply both sides by 3/8.(38)*(83x)=(38)*(16)x=6Answer:x=6

Anna35 [415]3 years ago

6 0

Ok so it's saying 2 * ( 2x + 12 )* 2/3 = 32

We need to solve for x. First we multiply 2 by everything in the parenthisis.

That leaves us with 4x + 24 * 2/3 = 32. Now we do 24 * 2/3 = 16

So 4x + 16 = 32 We need x alone so we subtract 16 from both sides, leaving us with 4x = 16 Now we divide both sides by 4

So x = 4

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Read 2 more answers

A half-century ago, the mean height of women in a particular country in their 20s was 64.7 inches. Assume that the heights of

Ainat [17]

Answer:

99.5% of all samples of 21 of today's women in their 20's have mean heights of at least 65.86 inches.

Step-by-step explanation:

We are given that a half-century ago, the mean height of women in a particular country in their 20's was 64.7 inches. Assume that the heights of today's women in their 20's are approximately normally distributed with a standard deviation of 2.07 inches.

Also, a samples of 21 of today's women in their 20's have been taken.

Let $\bar X$ = sample mean heights

The z-score probability distribution for sample mean is given by;

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

where, $\mu$ = population mean height of women = 64.7 inches

$\sigma$ = standard deviation = 2.07 inches

The Z-score measures how many standard deviations the measure is away from the mean. After finding the Z-score, we look at the z-score table and find the p-value (area) 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.

Now, Probability that the sample of 21 of today's women in their 20's have mean heights of at least 65.86 inches is given by = P( $\bar X$ $\geq$ 65.86 inches)

P( $\bar X$ $\geq$ 65.86 inches) = P( $\frac{\bar X -\mu}{\frac{\sigma}{\sqrt{n} } }$ $\geq$ $\frac{65.86-64.7}{\frac{2.07}{\sqrt{21} } }$ ) = P(Z $\geq$ -2.57) = P(Z $\leq$ 2.57)