3 years ago

HELPPPP (COMLEX NUMBERS AND OPERATIONS

Mathematics

1 answer:

Romashka [77]3 years ago

4 0

Answer:

54 + 39i

Step-by-step explanation:

Given

3i(2 - 5i)(4 + i) ← expand factors using FOIL

= 3i(8 - 18i - 5i² ) → using i² = - 1

= 3i(13 - 18i) ← distribute parenthesis by 3i

= 39i - 54i²

= 54 + 39i

You might be interested in

Twelve large bottles of water cost $9. a. How many bottles can you buy for $3?

Neko [114]

You can buy 4 bottles

7 0

3 years ago

Read 2 more answers

Can someone please give me the (Answers) to this? ... please ...

Kryger [21]

7. 125°

8. 53°

9. 113°

10. x = 7

75 = 11x - 2

11x = 77

x = 7

4 0

3 years ago

Read 2 more answers

(help me) Which is the correct operation to use to solve this problem?

antoniya [11.8K]

D 1,020÷15=68 (that's the equation and the answer)

4 0

3 years ago

A cylindrical garbage can has a radius of 2.8ft and holds 86.21 cubic feet of trash. whats the height?

Crazy boy [7]

Answer:

Correct choice is A

Step-by-step explanation:

The volume of the cylinder can be calculated using formula

$V=\pi r^2 h,$

where r is the base circle radius and h is the height of the cylinder.

In your case, $V=86.21\ ft^3,\ \ \ r=2.8\ ft,$

then

$86.21=\pi\cdot (2.8)^2\cdot h,\\ \\h=\dfrac{86.21}{7.84\pi}\approx \dfrac{86.21}{7.84\cdot 3.14}\approx 3.5\ ft.$

8 0

3 years ago

Given x = 3, y = 4x + 7 how do i do this

kow [346]

Answer:

x = 3, y = 19

Step-by-step explanation:

x = 3, y = 4x + 7

Substitute x =3 into the second equation

y =4*3+7

y = 12 +7

y = 19

x = 3, y = 19

5 0

4 years ago

Read 2 more answers