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4 years ago

Simplify -3.1+1.2 1.9 -4.3 3.7 4.3

Mathematics

2 answers:

oksano4ka [1.4K]4 years ago

8 0

Add -3.1 and 1.2 to get -1.9
Answer: -1.9 (This is simplified)

Hope this helps! :)

LenKa [72]4 years ago

8 0

-3.1+1.2
pretend you are doing this:" 3.1 - 1.2" Then when you get your answer, attach a negative sign
3.1-1.2=1.9
final answer = -1.9

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I have some cheese. I used

hram777 [196]

<h3>Answer: 2500 grams</h3>

============================================

Work Shown:

A = amount of grams of cheese you had originally

B = (2/5)*A = amount of cheese you use up after day 1

C = (3/5)*A = amount of cheese you have left over after day 1

note how B and C add back up to 'A'.

This is because 2/5+3/5 = 5/5 = 1, so,

B+C = (2/5)A+(3/5)A = (2/5+3/5)A = 1*A = A

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

D = (2/5)*C = amount of cheese you use up after day 2

E = (3/5)*C = amount of cheese left over after day 2

the variables D and E add up to C

we are told that there are 900 grams of cheese left after day 2, so E = 900

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

E = (3/5)*C

(3/5)*C = E

(3/5)*C = 900 ... Plug in E = 900

3C = 900*5 .... multiply both sides by 5

3C = 4500

C = 4500/3 .... divide both sides by 3

C = 1500

This means you had 1500 grams of cheese after day 1

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

C = (3/5)*A

(3/5)*A = C

(3/5)*A = 1500 ... plug in C = 1500

3A = 1500*5 ... multiply both sides by 5

3A = 7500

A = 7500/3 .... divide both sides by 3

A = 2500

-----------

<h3>You started off with 2500 grams of cheese.</h3>

After day 1, you use up (2/5)*2500 = 1000 grams of cheese and have 2500-1000 = 1500 grams left over.

After day 2, you use up (2/5)*1500 = 600 grams of cheese and have 1500-600 = 900 grams left over.

The answer is confirmed.

6 0

4 years ago

How to simplify this expression??

sdas [7]

Answer :

Step-by-step-explanation :

${x}^{2} + 4x + 5 - {(x + 2)}^{2} \\ {x}^{2} + 4x + 5 - ( {x}^{2} + 4x + 4) \\$

${x}^{2} + 4x + 5 - {x}^{2} - 4x - 4 = {x}^{2} - {x}^{2} + 4x - 4x + 5 - 4 = 5 - 4 = 1$

8 0

4 years ago

Read 2 more answers

What part of an hour elapses from 3:12 P.M. to 4:30 P.M.?

sergejj [24]

Answer: $\frac{13}{10}$ of an hour.

Step-by-step explanation:

1. You know that it is from 3:12 p.m. (48 minutes before 4:00 p.m.) to 4:30 p.m. (30 minutes after 4:00 p.m.)

2. Therefore, you must make the following addition:

$48minutes+30minutes=78minutes$

This is 78 minutes out of 1 hour (60 minutes).

3. Therefore, you have the following fraction:

$\frac{78}{60}$

4. Now, you must reduce the fraction:

$\frac{78}{60}=\frac{13}{10}$

5. The answer is 13/10 on an hour.

5 0

3 years ago

The points on the graphs represent relations. Classify these relations according to whether or not they are functions.

tiny-mole [99]

<h2>Answer:</h2>

A function $f$ from a set $A$ to a set $B$ is a relation that assigns to each element $x$ in the set $A$ exactly one element $y$ in the set $B$ . The set $A$ is the domain (also called the set of inputs) of the function and the set $B$ contains the range (also called the set of outputs).

First figure is not a function because the x-coordinate 2 has more than one element in the set of outputs.

Second figure is a function because this each element $x$ in the set $A$ is assigned to exactly one element $y$ in the set $B$ .

Third figure is not a function because the x-coordinates -1, 1 and 2 have assigned more than one element in the set of outputs.

Fourth figure is a function because this each element $x$ in the set $A$ is assigned to exactly one element $y$ in the set $B$ .

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3 years ago

Which equation can be used to find the value of X

irakobra [83]

Answer:

Step-by-step explanation:

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3 years ago