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3 years ago

Which of the following are quadratic equations

Mathematics

1 answer:

Igoryamba3 years ago

6 0

Answer:

<h2>HOPE U UNDERSTOOD</h2>

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What is the value of the expression below when a =−3, b =2, and c = −4 ?∣a2−2ac+5c? l

olchik [2.2K]

Answer:

Value of the expression is -35

Step-by-step explanation:

$Given \: expression \: is \\ {a}^{2} - 2ac + 5c \\ values \: are \: a = - 3 \: \ \: \: \: b = 2 \: \: \: \: c = - 4 \\ on \: substituting \: the \: values \ \\ in \: the \: given \: expression \\ { - 3}^{2} - 2( - 3)( - 4) + 5( - 4) \\ = 9 - 24 - 20 \\ = - 35$

HAVE A NICE DAY!

THANKS FOR GIVING ME THE OPPORTUNITY TO ANSWER YOUR QUESTION. 

3 0

3 years ago

What is the volume of the sphere?

Eddi Din [679]

V = 4/3 * pi * r^3
V= 4/3 3.14 * 3^3
V = 4/3 *3.14 * 27
27 * 3.14 = 84.78
V = 4/3 * 84.78 = 113.04
V = 113.04
hope this helps

7 0

4 years ago

Read 2 more answers

Solve the missing variable. Show your process please because I did the other three on my homework sheet but I really struggle wi

kotykmax [81]

Follow these steps:

-8.4b - 4.2 = 12.6

Add 4.2 on both sides:

-8.4b = 16.8

Divide by -8.4 on both sides to give you the final answer of:

b = -2

So you're answer is indeed correct! Hope this helps and that the steps are clear enough!

5 0

3 years ago

Read 2 more answers

I need to know the letter order these go in

Serjik [45]

Answer:

if you are talking about the sentence you just said themln

go i in know letter need order the these to

Step-by-step explanation:

if thats not what you want then you gotta elaborate

4 0

3 years ago

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A local artist working at the town fair makes caricatures and portraits. The caricatures cost $4 to make white

il63 [147K]

Answer:

The artist should make 15 caricatures and 30 portraits.

Step-by-step explanation:

First, we identify the variables for the problem. In this case, the variables will be:

C=number of caricatures

P= number of portraits.

Next, we can use the variables to make the inequalities that constrain the problem.

We know the artist can't spend more than $360 for supplies and we also know that it costs $4 to make a caricature and $10 to make a portrait, so:

$4C+10P\le 360$

We also know the artist has a limit of time of 20 hours, which is the same as 20*60=1200 minutes to paint. We know it takes her 20 minutes to make a caricature and 30 minutes to make a portrait, so:

$20C+30P\le 1200$

and we also know she must make a positive number of caricatures and a positive number of portraits so the other two constrains are:

$C\ge 0$

$P\ge 0$

So we can go ahead and graph them. (see attached picture)

Once we graphed the inequalities we can determine what the corners of the polygon created by the intersection of the shaded areas are, so we proceed and calculate them:

first point:

(0,0)

second point:

4(0)+10P=360

$P=\frac{360}{10}$

P=36

(0,36)

Third point:

20C+30(0)=1200

$C=\frac{1200}{20}$

C=60

(60,0)

Fourth point:

$4C+10P = 360$

$20C+30P = 1200$

We multiply the first equation by -5 so we get:

-20C-50P=-1800

20C+30P=1200

------------------------

-20P=-600

P=30

so:

20C+30(30)=1200

20C=1200-900

20C=300

C=15

(15,30)

Once we found the 4 points, we go ahead and evaluate them for the objective function. In this case, the objective function is the total amount of money she got from selling the pieces of art, so we get:

I=10C+20P

Point 1

I=10(0)+20(0)=0

Point 2

I=10(0)+20(36)=720

Point 3

I=10(60)+20(0)=600

Point 4

I=10(15)+20(30)=750

Next, we look for the greatest income which in this case will be 750 so that's why she must make 15 caricatures and 30 Portraits.

8 0

3 years ago