All categories

2 years ago

Which of the following products yield a real number? Select all that apply.

Mathematics

1 answer:

solong [7]2 years ago

4 0

Answer:

The choice 4 and 6 ;

$7i(7i)$

and

$(9 + 3i)(9 - 3i)$

Step-by-step explanation:

$7i(7i) = 49 {i}^{2} = - 49$

__o_o__

$(9 + 3i)(9 - 3i) \\ = 81 - 27i + 27i - 9 {i}^{2} \\ = 81 + 9 \\ = 90$

You might be interested in

What is the sum of 4 and p?

Murrr4er [49]

Answer:

4+p

Step-by-step explanation:

8 0

3 years ago

Please help ASAP will brainliest

NikAS [45]

Step-by-step explanation:

please mark me as brainlest

7 0

3 years ago

Read 2 more answers

A cylindrical cake with a height of 5 inches has a 30 degree slice removed. If the volume of the removed slice is 40 inches what

sesenic [268]

Answer: $5.52\ in.$

Step-by-step explanation:

Given

Height of cylindrical cake is $h=5\ in.$

$30^{\circ}$ slice is removed

Volume of the slice is $V=40\ in.^3$

Area of slice is

$\Rightarrow \dfrac{30^{\circ}}{360^{\circ}}\times \pi r^2\\\\\Rightarrow \dfrac{\pi r^2}{12}$

Volume of slice will be multiplication of area and height

$\Rightarrow V=A\times h\\\\\Rightarrow 40=\dfrac{\pi r^2}{12}\times 5\\\\\Rightarrow \pi r^2=\dfrac{40\times 12}{5}\\\\\Rightarrow r^2=\dfrac{40\times 12}{3.142\times 5}\\\\\Rightarrow r^2=30.55\\\Rightarrow r=5.52\ in.$

Hence, the radius of the cake is $5.52\ in.$

4 0

3 years ago

DESPERATELY NEED HELP!! TANGENT LINES; WHAT IS THE VALUE OF X? PLEASE EXPLAIN! BRAINLIEST GIVEN!!

ycow [4]

I believe x is 30 degrees.

The equilateral triangle has each angle equal to 60 degrees. So the small arc near x is also 60. The angle x is half the arc so would be 30.
This also makes sense because the triangle it forms with angle x and the center has center angle of 60 and angle formed by tangent and radius of 90. So it is a 30-60-90 triangle, making angle x 30.

4 0

3 years ago

What is the measure of arc EA? A. 21 B. 36 C. 30 D. 51

DochEvi [55]

Based off the measures of the arcs DC and AB, your answer should be B. 36 Hope it helps.

4 0

3 years ago

Read 2 more answers