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
kifflom [539]
3 years ago
10

I need to know 4 I really don't understand I really need help please.

Mathematics
1 answer:
Effectus [21]3 years ago
5 0
Answer is A. Because out kidneys and lungs pump bloo Im poitive
You might be interested in
PLEASE HELP ME ON THESE PROBLEMS, ITS URGENT! (Help for any of these would be greatly appreciated!)
Anvisha [2.4K]
1.) We can solve the problem by developing a linear model.
Let x represent the quantity to be used of the grade of coffee that sells for $70 per pound, and y represent the quantity to be used of the grade of coffee that sells for $80 per pound, then
\left\begin{array}{c}x+y=80 . . . (1)\\70x+80y=76(80) . . . (2)\end{array}\right  \\   \\ \Rightarrow  \left\begin{array}{c}80x+80y=6400 . . . (3)\\70x+80y=6080 . . . (4)\end{array}\right  \\  \\ \Rightarrow10x=320 \\  \\ \Rightarrow x=32 \\  \\ \Rightarrow y=80-32=48
Therefore, 32 pounds of the grade of coffee that sells for $70 per pound, and 48 pounds of the grade of coffee that sells for $80 per pound should be used.


2.) Volume of alcohol in the original mixture
\frac{35}{100} \times 40=14 quarts

Let x be the number of quarts of alcohol to be added, then
Volume of alcohol in the new mixture
\frac{48}{100} \times (40+x)=14+x \\  \\ \Rightarrow19.2+0.48x=14+x \\  \\ \Rightarrow0.52x=5.2 \\  \\ \Rightarrow x=10

Therefore, 10 quarts of pure alcohol should be added


3.) Original proportion of white paint in the mixture
=\frac{5}{5+11}=\frac{5}{16}

Let x be the number of gallons of white paint to be added, then
\frac{5+x}{16+x}=\frac{2}{3} \\  \\ \Rightarrow3(5+x)=2(16+x) \\  \\ \Rightarrow15+3x=32+2x \\  \\ \Rightarrow x=32-15=17
Therefore, 17 gallons of white paint should be added.


4a.) Let the three consecutive odd integers be x - 2, x and x + 2, then
x - 2 + x + x + 2 = 25 \\  \\ \Rightarrow3x=25\Rightarrow x=8.33
which is not an integer.
Hence, the sum of three consecutive odd integers cannot be 25.

4b.) Let the three consecutive odd integers be x - 2, x and x + 2, then
x - 2 + x + x + 2 = 45 \\ \\ \Rightarrow3x=45\Rightarrow x=15
Thus, the three consecutive odd intergers whose sum is 45 are 13, 15 and 17.


5.) If all pipes are open and the tank was initially empty, let t be the time it will take to fill the tank, then
\frac{1}{t} = \frac{1}{9} + \frac{1}{12} - \frac{1}{15} = \frac{20+15-12}{180} = \frac{23}{180} \\  \\ \Rightarrow t= \frac{180}{23} =7.83
Therefore, it will take 7.83 hours to get the tank filled up.
3 0
3 years ago
According to the Pew Internet & American Life Project, 54% of Internet users have a wireless connection to the Internet via
Setler79 [48]

Answer: 0.135

Step-by-step explanation:

if 54 % of internet users have a wireless connection then number of people that do nor have a wireless connection =46%.

Let A be the event that 54% of internet users have wireless connection.

Let B be the event that 25% of these users that have internet connection use twitter to share updates about themselves.

Hence, probability of A and B happening becomes:

P(AnB) = P(A) * P(B)

P(AnB) = 0.54 * 0.25

P(AnB) = 0.135

4 0
3 years ago
How can I do this I'm so stuck on this plz help
Stolb23 [73]
You're just changing the given rate into a unit rate: follow along and do the division shown and fill in the blanks. 320 ÷16 = 20

So the unit rate is \frac{20mi}{1gal}
8 0
3 years ago
Read 2 more answers
a committee is to consist of two members. if there are seven people available to serve on the committee, how many different comm
Doss [256]

Answer:

66

Step-by-step explanation:

Use the combination formula.

8 0
3 years ago
Read 2 more answers
What are the dimensions of the outside rectangle?
Inessa [10]

Outer Square perimeter minus inside perimeter equals outside square perimeter

5 0
3 years ago
Other questions:
  • In a test, the 10 students in group 1 get a mean score of 43%.
    10·1 answer
  • Need help finding the volumes of this pyramid please
    7·1 answer
  • Mae read 976 pages in 8 weeks.she read the same number of pages each week. How many pages did she read each work
    6·2 answers
  • In 2011, a U.S. Census report determined that 71% of college students work. A researcher thinks this percentage has changed sinc
    12·1 answer
  • X+2y=7 <br> 3x-2y=-3 solving systems by substitution
    7·1 answer
  • PLA HELP ME ASAP FOR 7, 8, and 9 (SHOW WORK!) POINTS!!!
    12·1 answer
  • Please help
    13·1 answer
  • 5. Name a pair of supplementary angles.
    7·2 answers
  • Point B has coordinates ​(5​,2​). The​ x-coordinate of point A is 1. The distance between point A and point B is 5 units. What a
    6·1 answer
  • Find the probability that a single randomly selected value is greater than 204.3. Round your answer to four decimal places.
    13·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!