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
alexandr402 [8]
2 years ago
15

Determine the value of k needed for x = 4 to be a solution of x ^ 3 - 6x ^ 2 - 7x + k = 0

Mathematics
1 answer:
AleksAgata [21]2 years ago
5 0

Answer:

k=60

Step-by-step explanation:

64-(6*16)-28+k=0

64-96-28+k=0

-60+k=0

k=60

You might be interested in
the money used in south Africa is is called the rand . the estrange rate 7 rand for $1. Find how many dollars you would receive
Tasya [4]

Answer:

$3

Step-by-step explanation:

21 rand * ($1/7 rand) = $3

4 0
3 years ago
Help!!! Just those two, please
Lunna [17]

A. Multiply the area of the original store by the percent increase then add that to the original amount.

1200 x 0.75 = 900

1200 + 900 = 2100

Answer: 2,100 square feet.

B. 2000 x 0.30 = 600

2000 + 600 = $2,600

2600 x 0.05 = 130

2600 + 130 = 2,730

Rent :$2,730

4 0
3 years ago
A certain brand of flood lamps has a lifetime that is normally distributed with a mean of 3,750 hours and a standard deviation o
vesna_86 [32]
Given that mean=3750 hours and standard deviation is 300:
Then:
<span>a. The probability that a lamp will last for more than 4,000 hours?
P(x>4000)=1-P(x<4000)
but
P(x<4000)=P(z<Z)
where:
z=(x-</span>μ)/σ
z=(4000-3750)/300
z=0.833333
thus
P(x<4000)=P(z<0.8333)=0.7967
thus
P(x>4000)=1-0.7967=0.2033

<span>b.What is the probability that a lamp will last less than 3,000 hours?
P(x<3000)=P(z<Z)
Z=(3000-3750)/300
z=-2.5
thus
P(x<3000)=P(z<-2.5)=0.0062

c. </span><span>.What lifetime should the manufacturer advertise for these lamps in order that only 4% of the lamps will burn out before the advertised lifetime?
the life time will be found as follows:
let the value be x
the value of z corresponding to 0.04 is z=-2.65
thus
using the formula for z-score:
-2.65=(x-3750)/300
solving for x we get:
-750=x-3750
x=-750+3750
x=3000</span>
7 0
4 years ago
the library at a certain University reported the journal prices had increased by 150% over a period of 10 years The report concl
natima [27]
1.15¹⁰=4.0456, the growth rate, so the increase is 3.0456 or 305%.
7 0
3 years ago
Read 2 more answers
a circular stained glass window frame with a diameter 20 inches is divided into 8 congruent find the area of 3 of the 8 panes of
ahrayia [7]

Answer:

it would be 45

Step-by-step explanation:

6 0
3 years ago
Other questions:
  • -6x is less than or equal to 4x+2
    10·1 answer
  • IS IT 4.5?
    13·1 answer
  • Carey is trying to decide between two guitars. The first had an original price of $160, but is on sale for $100. The second had
    15·2 answers
  • Factor completely 4n 2 + 28n + 49
    5·2 answers
  • 2x + 20 = -3x-25 <br> this is due in 20 minutes!
    6·2 answers
  • A survey is taken among customers of a fast-food restaurant to determine preference for hamburger or chicken. Of 200 respondents
    6·1 answer
  • A science club at Emily's middle school has 25 members. Only 40% of the members attended Saturday meetings. What is the number o
    15·1 answer
  • What is y use the picture down below.<br> y=12x+3<br><br> y=12x−3<br><br> y=2x+3<br><br> y=2x−3
    7·1 answer
  • 2. Write an expression for the phrase, "The sum of 15 and twice a number.
    15·1 answer
  • In the diagram below of triangle UVW, X is a midpoint of UV and Y is a midpoint of VW. If mZY XV = 3x + 48, and mZWUX = x + 62,
    12·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!