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
gavmur [86]
3 years ago
6

How much water must be added to 5 qt of a saline solution that is 20% salt in order to reduce it to 15% salt?

Mathematics
1 answer:
jeka943 years ago
7 0

Answer:

your answer is 40

Step-by-step explanation:

5+20+15=

You might be interested in
What is the answer of equation 9x(30+7)=(9x30)+(9x7)
RSB [31]

(9x30) =270 (9x7)  =63


Distributive Property

5 0
3 years ago
Read 2 more answers
Assume that the empirical rule is a good model for the time it takes for all passengers to board an airplane. The mean time is 4
slamgirl [31]

Answer:

The interval that describes how long it takes for passengers to board the middle 95% of the time is between 40.16 minutes and 55.84 minutes.

Step-by-step explanation:

Problems of normally distributed samples can be solved using the z-score formula.

In a set with mean \mu and standard deviation \sigma, the zscore of a measure X is given by:

Z = \frac{X - \mu}{\sigma}

The Z-score measures how many standard deviations the measure is from the mean. After finding the Z-score, we look at the z-score table and find the p-value associated with this z-score. This p-value is the probability that the value of the measure is smaller than X, that is, the percentile of X. Subtracting 1 by the pvalue, we get the probability that the value of the measure is greater than X.

In this problem, we have that:

\mu = 48, \sigma = 4.

Which interval describes how long it takes for passengers to board the middle 95% of the time?

This is between the 2.5th percentile and the 97.5th percentile.

So this interval is the value of X when Z has a a pvalue of 0.025 and the value of X when Z has a pvalue of 0.975

Lower Limit

Z has a pvalue of 0.025 when Z = -1.96. So

Z = \frac{X - \mu}{\sigma}

-1.96 = \frac{X - 48}{4}

X - 48 = -1.96*4

X = 40.16

Upper Limit

Z has a pvalue of 0.975 when Z = 1.96. So

Z = \frac{X - \mu}{\sigma}

1.96 = \frac{X - 48}{4}

X - 48 = 1.96*4

X = 55.84

The interval that describes how long it takes for passengers to board the middle 95% of the time is between 40.16 minutes and 55.84 minutes.

7 0
3 years ago
Please help me I have been trying to do this problem
Semmy [17]

Answer:

14 42 in thirds is 14 so if he had to pay a third he paid 14 bucks

Step-by-step explanation:

42/3=14

5 0
3 years ago
Read 2 more answers
Can someone please help me? i hope you can see this omg
Gemiola [76]

Step-by-step explanation:

length = (2x + 3) units

width = (x - 7) units

Area = 2( length × width)

Area = 2( (2x + 3) × (x - 7) )

Area = 2( 2x² - 14x + 3x - 21)

Area = 2 ( 2x² -11x - 21)

Area = 4x² - 22x - 42

3 0
3 years ago
Read 2 more answers
Olivia's team played 8 games of basketball. During those 8 games her team's score was: 70, 67, 79, 66, 64, 80, 64 and 75. Find t
castortr0y [4]

Answer:

70.6

Step-by-step explanation:

The mean is the average of a set of numbers.

To find it, add up all the terms and divide it by the number of terms.

70 + 67 + 79 + 66 + 64 + 80 + 64 + 75 = 565

565 / 8 = 70.625

Rounding this to the nearest tenth, we get an answer of 70.6

5 0
2 years ago
Other questions:
  • What is the simplified expression for 3^3 . 3^3/3^4
    14·1 answer
  • of the 400 vehicles that passed the intersection, 98 are buses. what percent of the vehicles that passed the intersection are bu
    11·1 answer
  • 2(4+2x)≥5x+5 Solve The Inequality, IDK what to do here
    5·1 answer
  • What is the equation that passes through (4, 3) and (2, -1)?
    8·2 answers
  • A sweater is regularly $32 it is 25% off the original price this week
    14·1 answer
  • .6988271188 as fraction
    6·1 answer
  • Help I know it English but I put math because no one was on English soo I decided to put math help me please if you correct you
    10·1 answer
  • Write the expression as a square of a binomial: 49x^2+12xy+64y^2
    6·1 answer
  • Thomas wanted to measure the width of the pond so he set up triangles as shown in the diagram. He claims the two triangles are s
    12·2 answers
  • Find the common difference for the given sequence<br> 1.2, 1.85, 2.5, 3.15, ...
    13·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!