All categories

3 years ago

Help me!! solve for d

Mathematics

1 answer:

SpyIntel [72]3 years ago

3 0

Answer:

d =±2sqrt(7) i

Step-by-step explanation:

d^2 = -28

Take the square root of each side

sqrt(d^2) = ±sqrt(-28)

d = ±sqrt(-28)

d = ±sqrt(-1)sqrt(28)

We know that sqrt(-1) = i

d =±i*sqrt(4)sqrt(7)

d =±i 2sqrt(7)

d =±2sqrt(7) i

You might be interested in

Abel Alonzo, Director of Human Resources, is exploring employee absenteeism at the Plano Power Plant. Ten percent of all plant e

Alex17521 [72]

Answer: 0.23

Step-by-step explanation:

Given : F is the event "works in the finishing department;"

and A is the event "is absent excessively."

Given : 10% of all plant employees work in the finishing department; 20% of all plant employees are absent excessively; and 7% of all plant employees work in the finishing department and are absent excessively.

i.e. P(A)= 0.20 ; P(F)=0.10 ; P(A ∩ F) = 0.07

We know that $P(X\cup Y)=P(X)+P(Y)-P(X\cap Y)$

Then,

$P(A\cup F)=P(A)+P(F)-P(A\cap F)\\\\\Rightarrow\ P(A\cup F)=0.20+0.10-0.07=0.23$

Hence, the required answer is $P(A\cup F)=0.23$

5 0

3 years ago

What is the value of the expression below <br> (-64)^2/3

damaskus [11]

Answer:

Step-by-step explanation:

$(-64)^2/3$

64 = $2^{6}$

$2^{6} ^{\frac{1}{3} } ^{2}$

$2^{ 2^{2} }$

$2^{4}$

7 0

3 years ago

The length of a rectangular field is 20 less than its width. The area of the field is 12,00 square feet. What is the width of th

satela [25.4K]

X(x-20)=12000
x^2 - 20x = 12000
x^2 - 20x - 12000 = 0
(x - 120)(x + 100) = 0

x = -100, 120

so the width is 120 ft

7 0

3 years ago

a fleece sitting on the very top of the minute hand on a grandfather clock. the minute hand measures 6 inches long. how far does

lawyer [7]

The minute hand makes 24 revolutions in one day, so the distance traveled is
.. 24*2π*r
.. = 24*2*π*(6 in) = 288π in ≈ 904.78 inches

5 0

4 years ago

As compared to its 1st year of operation, ABC company grew 8% in the 2nd year and an additional 2% per year for the next 2 years

kow [346]

Answer:

i believe its 30,000

Step-by-step explanation:

$\frac{12}{45000}$ = $\frac{8}{x}$

12x = 360000

x = 30,000

7 0

4 years ago