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3 years ago

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Adam is three years older than Joe. After three years, Adam's age will be four years less than two times Joe's age. Considering

Adam's present age as x years and Joe's present age as y years, write a pair of linear equations to model the above situation.

1 answer:

Romashka-Z-Leto [24]3 years ago

3 0

Answer:

X = 3+y

X = 2y - 4

Step-by-step explanation:

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A certain test preparation course is designed to help students improve their scores on the LSAT exam. A mock exam is given at th

OlgaM077 [116]

Answer:

Interval [16.34 , 21.43]

Step-by-step explanation:

First step. <u>Calculate the mean</u>

$\bar X=\frac{(23+18+23+12+13+23)}{6}=18.666$

Second step. <u>Calculate the standard deviation</u>

$\sigma =\sqrt{\frac{(23-18.666)^2+(18-18.666)^2+(23-18.666)^2+(12-18.666)^2+(13-18.666)^2+(23-18.666)^2}{6}}$

$\sigma=\sqrt\frac{18.783+0.443+18.783+44.435+5.666+18.783}{6}$

$\sigma=\sqrt{17.815}=4.22$

As the number of data is less than 30, we must use the t-table to find the interval of confidence.

We have 6 observations, our level of confidence DF is then 6-1=5 and we want our area A to be 80% (0.08).

We must then choose t = 1.476 (see attachment)

Now, we use the formula that gives us the end points of the required interval

$\bar X \pm t\frac{\sigma}{\sqrt n}$

where n is the number of observations.

The extremes of the interval are then, rounded to the nearest hundreth, 16.34 and 21.43

6 0

3 years ago

What is the value of x?<br><br><br> x+15=8<br><br> x=

melisa1 [442]

8-15= -7

x= -7

I think this is correct..

8 0

3 years ago

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Tiffany buys a basket of watermelons on sale for \$9$9 before tax. The sales tax is 9\%9%. What is the total price Tiffany pays

meriva

Answer: $9.81

Step-by-step explanation:

Here, Tiffany buys a basket of watermelons on sale for $9 before tax.

Therefore, Initial cost of a basket of watermelons = $9

And, he sales tax is 9%.

Therefore tax on a basket of watermelons,

9% of 9 = $\frac{9\times 9}{100} = 0.81$

But, The total cost of a basket of watermelons = initial cost + tax

= 9+0.81=9.81

Therefore, Tiffany pays $9.81 for the basket of watermelons.

8 0

3 years ago

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Each side of a square plastic tarp is 9 meters long. what is the tarps perimeter

emmainna [20.7K]

Answer:

36

Step-by-step explanation:

9 times 4

8 0

3 years ago

Please help I’ll give brainliest!!

natta225 [31]

Answer:

hi

Step-by-step explanation:

8 0

3 years ago