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3 years ago

Solve for b. Show your work: 3b+2(b-3)=4 HELP

Mathematics

1 answer:

Wewaii [24]3 years ago

6 0

Answer:

b=2

Step-by-step explanation:

First multiply everything in the parenthesis by the 2 outside of them then combine like variables to get the equation 5b-6=4 then subtract 6 from both sides then divide by 5 to get b=2.

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MATH HELP PLEASE! I NEED HELP IM DUMB

deff fn [24]

First of all...YOU'RE NOT DUMB!!! You just need some help! Being confident in your knowledge/skills is half the work! ;D

And second...

PART 1:

28. Polygon ABCDE is a pentagon (it has five sides). The sum of the interior angle measures for a pentagon is 540°. Here's what we know:

m<A = 90°

m<B = 90°

m<D = 90°

m<C = m<E

First, find the sum of the measures of angles A, B, and D.

(90)(3) = 270°.

Next, find the combined angle measure of angles C and E.

540 - 270 = 270°.

Finally, find the measure of angle E (or m<AED).

270 / 2 = 135°.

So, to fill in the blanks:

90 · 3 + x · 2 = 540

m<AED = 135°.

29.

(a) 360°

(b) hexagon

(d) hendecagon (11 sides)

I have attached a table containing a list of polygons, their side-count, and the sum of their interior angles.

PART 2:

Complimentary angles are angles whose measures add to equal 90°.

Supplementary angles are angles whose measures add to equal 180°.

30. 35° + 55° = 90°; Complimentary.

31. 62° + 108° = 170°; Neither.

Hope this helps!

5 0

4 years ago

Once his parachute is open, a skydiver descends at a rate of 25 feet per second. 90 seconds after the parachute opens, his altit

ss7ja [257]

Using the information given and linear function concepts, it is found that:

a) The equation is: $y(t) = -25t + 5000$ .

b) The skydiver’s altitude after the parachute has been open for 2 minutes is of 2000 feet.

c) It takes 200 seconds for the skydiver to reach the ground.

<h3>What is a linear function?</h3>

A linear function is modeled by:

$y(t) = mt + b$

In which:

m is the slope, which is the rate of change, that is, by how much y changes when t changes by 1.

b is the y-intercept, which is the value of y when x = 0.

Item a:

The skydiver descends at a rate of 25 feet per second, hence $m = -25$ .

Then:

$y(t) = -25t + b$

<u>90 seconds after the parachute opens, his altitude is 2750 feet</u>, which means that when $t = 90, y = 2750$ , which is used to find b. Then:

$2750 = -25(90) + b$

$b = 5000$

Hence, the equation is:

$y(t) = -25t + 5000$ .

Item b:

Time is in seconds, hence, this is y(120).

$y(120) = -25(120) + 5000 = 2000$

The skydiver’s altitude after the parachute has been open for 2 minutes is of 2000 feet.

Item c:

The time it takes to reach the ground is t for which y(t) = 0, hence:

$-25t + 5000 = 0$

$25t = 5000$

$t = \frac{5000}{25}$

$t = 200$

It takes 200 seconds for the skydiver to reach the ground.

You can learn more about linear functions at brainly.com/question/26065573

8 0

3 years ago

The relationship between the standard normal random variable z and normal random variable X is that :

alisha [4.7K]

Answer:

(B) The standard normal variable Z counts the number of standard deviations that the value of the normal random variable X is away from its mean

Step-by-step explanation:

Problems of normally distributed samples are solved using the z-score formula.

In a set with mean $\mu$ and standard deviation $\sigma$ , the zscore of a measure X is given by:

$Z = \frac{X - \mu}{\sigma}$

The Z-score measures how many standard deviations the measure is from the mean. After finding the Z-score, we look at the z-score table and find the p-value 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. Subtracting 1 by the pvalue, we get the probability that the value of the measure is greater than X.

Positive z-score: Above the mean

Negative z-score: Below the mean

All variables are continuous.

X can be positive or negative, just like Z

So the correct answer is:

(B) The standard normal variable Z counts the number of standard deviations that the value of the normal random variable X is away from its mean

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3 years ago

Which of these is an example of a random sample? A. A random fan asks for the band to play her favorite song at the next concert

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I believe that the correct answer is D

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3 years ago

A ramp into a building forms an 8° angle with the ground. If the entry point of the ramp is 7 feet from the building, how many f

frosja888 [35]

Answer: The correct answer is A) 0.98 feet

Step-by-step explanation: I took the test and got it correct.

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4 years ago