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
Natasha_Volkova [10]
2 years ago
7

Which of the following equations has no solution?

Mathematics
1 answer:
Ronch [10]2 years ago
8 0

Answer:

B and D

Step-by-step explanation:

Equations with the same x- term on both sides will have no solution

A

4x - 13 = 5(x + 4) = 5x + 20

4x ≠ 5x

This equation has a solution

B

5(3 + 2x) = 10x + 4

15 + 10x = 10x + 4

10x on both sides ⇒ no solution

C

2(3 - 5x) = 8(x + 1)

6 - 10x = 8x + 8

- 10x ≠ 8x

This equation has a solution

D

9x - 6 = 3(3x - 2) = 9x - 6

9x on both sides ⇒ no solution

You might be interested in
Multiply. (w-7) (w+4)
stira [4]

Use the FOIL (first, outside, inside, last) to expand the terms in the brackets.

(w - 7)(w + 4)

first: w × w = w²

outside: w × 4 = 4w

inside: -7 × w = -7w

last: -7 × 4 = -28

Now you add all the terms together to get:

w² + 4w - 7w - 28

This simplifies to give you:

w² - 3w - 28

Hope that helps! :)

5 0
2 years ago
A survey of 2306 adult Americans aged 18 and older conducted by Harris Interactive found that 417 have donated blood in the past
disa [49]

Answer:

a) p = 0.1808

b) Since 341.54 ≥ 10. Therefore the requirements for constructing a confidence interval  for p is satisfied.

c) The interval is (0.1676, 0.194)

d) We are 90% confident that the population proportion of adult Americans who have donated blood in the past two years is between 0.1676 and 0.194

Step-by-step explanation:

Given that:

n = 2306 and x =417

a)  Obtain a point estimate for the population proportion (p) is the ratio of sample successes to sample size.

Therefore: p = x / n = 417 / 2306 = 0.1808

p = 0.1808

b) requirements for constructing a confidence interval  for p is given by:

np(1-p) ≥ 10

Therefore: np(1-p) = 2306(0.1808)(1 - 0.1808) = 341.54 ≥ 10

Since 341.54 ≥ 10. Therefore the requirements for constructing a confidence interval  for p is satisfied.

c) c = 90% = 0.9

α = 1 - 0.9 = 0.1

α / 2 = 0.1 /2 = 0.05

From the probability table, z_{\frac{\alpha}{2} } = 1.645

Margin of error (e) = z_{\frac{\alpha}{2} } \sqrt{\frac{p(1-p)}{n} } =1.645* \sqrt{\frac{0.1808(1-0.1808)}{2306} }=0.0132

The boundaries are (p - e, p + e) = (0.1808 - 0.0132, 0.1808 + 0.0132) = (0.1676, 0.194)

The interval is (0.1676, 0.194)

d) We are 90% confident that the population proportion of adult Americans who have donated blood in the past two years is between 0.1676 and 0.194

6 0
3 years ago
Read 2 more answers
Write an equation in point-slope form for the line through the given point with the given slope. (-3,-5); m=-2/5
love history [14]
The point-slope formula is y-y1=m(x-x1). So you will substitute the numbers into the equation. The answer is y+5=-2/5(x+3).
3 0
3 years ago
Part two for: "HELP ME PLEASEEEE Using the digits 1 - 9, at most one time each, create an improper fraction and a mixed number t
KIM [24]

Answer: 5/3 = 1 10/6

Step-by-step explanation: This is the right answer.

5 0
1 year ago
How do you factor 5x^2 = 10x
denis-greek [22]
5x^2 = 10x 

5x^2-10x=10x-10x 

5x^2-10x=0 

     Use quadratic formula 

\quad x_{1,\:2}=\dfrac{-b\pm \sqrt{b^2-4ac}}{2a} 

\mathrm{For\:}\quad a=5,\:b=-10,\:c=0:\quad x_{1,\:2}=\dfrac{-\left(-10\right)\pm \sqrt{\left(-10\right)^2-4\cdot \:5\cdot \:0}}{2\cdot \:5} 

x=\dfrac{-\left(-10\right)+\sqrt{\left(-10\right)^2-4\cdot \:5\cdot \:0}}{2\cdot \:5}:\quad 2 

x=\dfrac{-\left(-10\right)-\sqrt{\left(-10\right)^2-4\cdot \:5\cdot \:0}}{2\cdot \:5}:\quad 0 

x=2,\:x=0
8 0
3 years ago
Read 2 more answers
Other questions:
  • Like a good economist, you calculated the opportunity cost of getting your college degree. Suppose that at your university, you
    13·2 answers
  • -6*4/2*3-15 help please
    6·2 answers
  • The Resizer changes from 9 feet tall to 2.7 feet tall. What percent of change is that?
    8·2 answers
  • How many 4-digit numbers are multiples of at least one of these two numbers: 2; 5.
    5·1 answer
  • Solve 12^x-2=20 round to the nearest ten-thousandth? help, please!
    6·2 answers
  • Mrs.Lewis bought 100 yards of ribbon.She used some of the ribbon to decorate dresses .Now she has 67 yards of ribbon remaining.
    9·1 answer
  • Jimbob kicks a soccer ball into the air. The equation = −( − 4)^2 + 8 represents the path the ball traveled.
    6·1 answer
  • Help me plz i’ll give brainlest
    8·1 answer
  • <img src="https://tex.z-dn.net/?f=%28%20-%209%29%20%7B%20%7D%5E%7B2%7D%20%20-%20%20%5Csqrt%5B3%5D%7B8%3F%7D%20" id="TexFormula1"
    15·1 answer
  • 29. Find the value of t if<br><br> t:7=1:2
    11·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!