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
Eduardwww [97]
3 years ago
9

Please help I have to get this done today

Mathematics
2 answers:
Nesterboy [21]3 years ago
8 0

Answer:

D

Step-by-step explanation:

Yes. When –4 is substituted for the variable, the result is a true statement.

mylen [45]3 years ago
5 0
C is the correct answer.
You might be interested in
20 is 15% of what number?<br> PLEASE ANSWER ILL GIVE BRAINLIESTTTT
Taya2010 [7]

Answer:

133.33

Step-by-step explanation:

8 0
3 years ago
Read 2 more answers
Calculate S58 for the arithmetic sequence {an}= {5/6n+1/3} If you could show me the steps that would be great. I keep following
Amanda [17]

Answer is 8671/6 which is the third choice

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

Work Shown:

Find the first term of the sequence by plugging in n = 1

a_n = (5/6)*n + 1/3

a_1 = (5/6)*1 + 1/3    replace n with 1

a_1 = 5/6 + 1/3

a_1 = 5/6 + 2/6

a_1 = 7/6

Repeat for n = 58 to get the 58th term

a_n = (5/6)*n + 1/3

a_58 = (5/6)*58 + 1/3    replace n with 58

a_58 = (5/6)*(58/1) + 1/3

a_58 = (5*58)/(6*1) + 1/3

a_58 = 290/6 + 1/3

a_58 = 145/3 + 1/3

a_58 = 146/3

Now we can use the s_n formula below with n = 58

s_n = (n/2)*(a_1 + a_n)

s_58 = (58/2)*(a_1 + a_58)    replace n with 58

s_58 = (58/2)*(7/6 + a_58)   replace a_1 with 7/6

s_58 = (58/2)*(7/6 + 146/3)   replace a_58 with 146/3

s_58 = (58/2)*(7/6 + 292/6)

s_58 = (58/2)*(299/6)

s_58 = (58*299)/(2*6)

s_58 = 17342/12

s_58 = 8671/6


5 0
2 years ago
Let $a$ and $b$ be nonzero real numbers such that
algol [13]
<h3>Answer:   -7/2</h3>

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

Explanation:

Let's expand out (2 - 7i)(a + bi) using the FOIL rule

(2 - 7i)(a + bi) = 2a + 2bi - 7ai - 7bi^2

(2 - 7i)(a + bi) = 2a + 2bi - 7ai - 7b(-1)

(2 - 7i)(a + bi) = 2a + 2bi - 7ai + 7b

(2 - 7i)(a + bi) = (2a+7b) + (2bi-7ai)

(2 - 7i)(a + bi) = (2a+7b) + (2b-7a)i

We're told the result is purely imaginary. What this means is that the real part (2a+7b) is zero, while the imaginary part (2b-7a) is nonzero. If both are zero, then we have 0+0i = 0 which is purely real.

For example, the complex numbers 0-7i and 0+2i are purely imaginary.

Let's use the fact that 2a+7b must be zero to do the following steps:

2a+7b = 0

2a = -7b

a = -7b/2

a/b = -7/2 which is the final answer

We must check to see if 2b-7a is nonzero

2b - 7a = 2b - 7(-7b/2)

2b - 7a = 2b + 24.5b

2b - 7a = 26.5b

The result is nonzero if and only if b is nonzero. Luckily we're told b is nonzero at the top of the problem. So we don't have any worries that (2b-7a) is zero.

Therefore, (2a+7b) + (2b-7a)i will be purely imaginary with a/b = -7/2

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

A concrete example:

Let a = -14 and b = 4

a/b = -14/4 = -7/2

(2-7i)(a+bi) = (2-7i)(-14+4i) = 0 + 106i which is purely imaginary.

I'll let you do the steps in expanding that out using the FOIL rule.

4 0
1 year ago
What is 3/4 divided by 1/4
Over [174]

Answer:

3

Step-by-step explanation:

7 0
2 years ago
Read 2 more answers
a bag contains 5 blue, 8 red, and 7 green marbles. a marble is selected at random. Write each answer as a fraction, percent, and
jonny [76]

Answer:

1/4 and 0.25 and 25% chance for blue, 2/5 and 0.4 and 40% chance for red, and 7/20 and 0.35 and 35% for green.

Step-by-step explanation:

add all the marbles (20) and that’s the total. then however many marbles in the color that’s the top number in the fraction. divide the top number by the bottom number to get the decimal and move the decimal 2 spaces to the right to get the percent.

4 0
3 years ago
Other questions:
  • The school baseball team won 34 and tied 3 of their 52 games what fraction of their games did the team lose
    12·1 answer
  • Which equation represents the slope-interecept form of line below? y-intercept = (0,-6) slope = -5​
    10·1 answer
  • A botanist predicts that the height of a certain tree will increase by 2% every year. If the height of the tree is now 50 feet,
    12·1 answer
  • A manufacturer of a new medication on the market for Alzheimer's disease makes a claim that the medication is effective in 65% o
    13·1 answer
  • Andrew made $625 mowing lawns. He worked for 5 consecutive days and earned the same amount of money each day. How much money did
    8·1 answer
  • 8n- (4n+7)=17 how do I solve
    9·2 answers
  • What is the perimeter P of △DEF to the nearest whole number?
    13·1 answer
  • 4x + 8y<br> 4(2) +8(-1)<br> 8 +(-8)<br> 0<br> What is the answer?
    5·1 answer
  • Need help y’all. Plz help me :(
    9·1 answer
  • -5= -10+y how do i reorder this and why do i reorder it in that way? i think i know how to reorder it i'm just confused on why i
    10·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!