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3 years ago

Evaluate 5t + 4 if t=3 PLEASE HURRY! I'M TIMED!

Mathematics

1 answer:

Wittaler [7]3 years ago

4 0

Substitute the value of the variable into the equation and simplify.
19

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Divide $200 in the ratio 3:2 what is the result?

Paul [167]

$120 and the ratio is 3:2
$200 6:4 and half

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3 years ago

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There are 7 more girls than boys in a class. There are 23 students in the class in all how many girls are there in the class. Wh

Flura [38]

The unknown is how many girls and boys are in the class.

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3 years ago

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. Calculate the mean

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

Second step. Calculate the standard deviation

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

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

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

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 volume of this rectangular prism?

ollegr [7]

Answer:

$57,600cm {}^{2}$

Solving steps:

To find the volume of a rectangular prism, multiply its 3 dimensions: length x width x height. The volume is expressed in cubic units.

=> 40 cm ${}^{2}$ × 30cm ${}^{2}$ × 48 cm ${}^{2}$

multiply all the numbers

=> 57,600cm ${}^{2}$

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8 0

2 years ago

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Write an equation that is perpendicular to y= 1/2x+5 and passes through (4,8)

goblinko [34]

Answer:

y = -2x + 16.

Step-by-step explanation:

The slope of the perpendicular line = -1 / slope of the given line

= -1 / 1/2 = -2.

Using the point slope form of the equation of a straight line:

y - y1 = m (x - x1)

y - 8 = -2(x - 4)

y - 8 = -2x + 8

y = -2x + 16 is the required equation.

4 0

3 years ago