1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
BaLLatris [955]
3 years ago
15

Find the value of the variable using these steps.

Mathematics
2 answers:
Aleks [24]3 years ago
4 0
0.4x+3.9=5.78 ⇒ subtracting 3.9 form both sides

0.4x+3.9-3.9=5.78-3.9

0.4x=1.88 ⇒ Divide both sides by 0.4

\frac{0.4x}{0.4}= \frac{1.88}{0.4}

x=4.7
Zanzabum3 years ago
4 0

He is correct just took the test 4.7!!!!!!!!!!!

You might be interested in
Louise, Tammy, Delores, and Sheryl score 78 points total in the tennis matches they play. They score a consecutive number of poi
irga5000 [103]

\huge\boxed{18\ \text{points}}

We'll represent Louise's, Tammy's, Delores's, and Sheryl's point values with x, x+1, x+2, and x+3 respectively since each one is 1 point more than the last.

Add all of these values up and set it all equal to 78.

x+x+1+x+2+x+3=78

Now, simplify.

4x+6=78

Subtract 6 on both sides.

\begin{aligned}4x+6-6&=78-6\\4x&=72\end{aligned}

Divide both sides by 4.

\begin{aligned}\frac{4x}{4}&=\frac{72}{4}\\x&=\boxed{18}\end{aligned}

Since Louise's score is x, the answer is 18.

<h3>Double-checking</h3>

To verify our answer, add the point totals 18, 19, 20, and 21.

This equals 78, so we can be sure the answer is correct.

5 0
2 years ago
Two step equations algebra 3x+2=11
valentinak56 [21]

Answer:

3x+2=11

     -2 -2

3x=9

3/3

9/3

x=3

Final answer : x = 3

Hope it helped! : )

8 0
4 years ago
Read 2 more answers
The table shows information about the numbers of hours 30 children spent on their tablets one evening.A) Find the class interval
Tresset [83]

Answer:

A- 2<h<3   B- 2.2

Step-by-step explanation:

 when you make a dot plot, the median is 11. using that dot plot, you can approximate a mean to be around 2

8 0
3 years ago
One uranium atom has a mass of 3.95 x 10^-22 grams.
creativ13 [48]
Remember
(ab)/(cd)=(a/c)(b/d)
and
\frac{x^n}{x^m}=x^{n-m}

1kg=1000g=1*10^3g
hmm, I estimate, 4 of them

x=number of attoms
mass of 1 times x=1*10^3
3.95*10^-22 times x=1*10^3
divide both sides by 3.95*10^-22
x=\frac{1*10^3}{3.95*10^{-22}}= (\frac{1}{3.95}  )( \frac{10^{3}}{10^{-22}} )=0.25316*10^{25}=2.5316*10^{24}
a million has 9 zeroes
so 24 zeroes is alot that is a <span>septillion, so there are 2.5316 septillion uranium atoms in 1kg


a. 4
b. underestimate

</span>
5 0
3 years ago
Acellus Find the expected value of a random variable x having the following probability distribution. 0 1 2 3 4 5 Probability 1/
barxatty [35]

Answer:

"2.25" is the right answer.

Step-by-step explanation:

According to the question,

The expected value will be:

= \sum_{i=1}^{n} x_i P(X = x_i)

= 0\times \frac{1}{8}+1\times \frac{1}{4}+2\times \frac{3}{16}+3\times \frac{1}{4}+4\times \frac{1}{6}+5\times \frac{1}{8}

= 0+\frac{1}{4}+\frac{3}{8} +\frac{3}{4}+\frac{1}{4} +\frac{5}{8}

= \frac{1}{4} +\frac{8}{8} +\frac{4}{4}

= \frac{1}{4} +1+1

= 0.25+2

= 2.25

Thus the above is the right approach.

8 0
3 years ago
Other questions:
  • Megan wants to retile her bathroom floor. If the home improvment store sel
    9·1 answer
  • Solve for x.<br><br><br><br> 5x−2(x+1)=14 ​
    7·2 answers
  • Can someone please explain what and how to do this. i don’t get it.
    15·2 answers
  • Please help. Due soon.
    15·1 answer
  • The midsegment through the legs of an isosceles triangle is 4 in. Find the sides of the triangle if its perimeter is 20 in. 75 p
    5·2 answers
  • I will mark brainiest is my answer is correct? I just got confuse because it saying do not simplify
    7·1 answer
  • A kitchen floor has 15 1/2 tiles in an area of 2 2/5 square feet. How many tiles are in one square foot?
    13·1 answer
  • If i have 2 lemons and i give 1 away. how many do i have now?
    11·1 answer
  • Help please it’s a unit test
    8·1 answer
  • At which values of x does the function F(x) have a vertical asymptote? Check
    15·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!