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3 years ago

Find the product and simplify 3a3 (-3a2 + 5a - 5)

Mathematics

1 answer:

djyliett [7]3 years ago

3 0

Answer:

Step-by-step explanation:

3a3 (-3a2 + 5a - 5)

Product: -9a5 + 15a4 - 15a3

3a3 (-3a2 + 5a - 5)

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A farmer collects 8 bushels of apples. Each bushel contains 126 apples. If she sells 2 and 1/2 bushels to a local store, how man

Vaselesa [24]

The farmer has 819 apples left

4 0

3 years ago

Read 2 more answers

I am so confused please help

Lemur [1.5K]

Answer:

a. $2\sqrt{31}$

b. 3

c. $3\sqrt{5}$

d. $2\sqrt{3}$

Step-by-step explanation:

This is a simple quadratic formula "substitution".

Essentially what you do is replace the "b" in the formula given above, with a "b" value from your given choices, same goes for "a" and "c" values.

You replace them and then solve the quadratic formula equation.

Ex. For the first set of values in your question, you make the formula into:

$\sqrt{2^2-4(5)(-6)$ And there you would solve normally.

2 squared is 4, so you get 4 - [4 * 5 * -6]

Which after solving leaves you with: $\sqrt{2^2+124}$

Then you do Prime Factorization of 124, leaving you with: $\sqrt{2^2*31}$

Then you apply the radical rule, leaving you with: $2\sqrt{31}$

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3 years ago

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On a coordinate plane, 2 lines intersect at (negative 1, 5). Which appears to be the solution to the system of equations shown i

Doss [256]

(-1, 5) because if you plug in -1 to both equations, you should get 5 from both equations. They also cross at that point, making that the solution.

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3 years ago

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The data represent the results for a test for a certain disease. Assume one individual from the group is randomly selected. Find

SOVA2 [1]

Answer:

0.505 = 50.7% probability of a negative test.

Step-by-step explanation:

A probability is the number of desired outcomes divided by the number of total outcomes.

In this question:

142 + 6 = 148 people tested positive. Of those, 142 had the disease and 6 did not.

7 + 145 = 152 people tested negative. Of those, 7 had the disease and 145 did not.

Find the probability of getting someone who tests negative, given that he or she did not have the disease.

This is the probability of a negative test.

152 negative tests out of 148 + 152 = 300

152/300 = 0.507

0.505 = 50.7% probability of a negative test.

5 0

3 years ago

When i stand 30 feet away from a tree at home, the angle of elevation to the top of the tree is 50◦ and the angle of depression

geniusboy [140]

You can use the information given in the problem above to draw the diagram of the situation, as you can see in the figure attached.
You must calculate the heights $h1$ and $h2$ and sum them to find the total height $Ht$ of the tree, as below:

$Tan(50)=\frac{h1}{30} \\ h1=35.75ft$

$Tan(10)=\frac{h2}{30} \\ h2=5.28ft$

$Ht=h1+h2\\ Ht=41 ft$

The answer is: $41 ft$

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3 years ago