MATHEMATICS HIGH SCHOOL

Evaluate (3+8i)(-2-i)

Answers

Answer 1

Answer:

Answer:

2 - 19i

Step-by-step explanation:

note that i² = - 1

given

(3 + 8i)(- 2 - i) ← expand using FOIL

= - 6 - 3i - 16i - 8i²

= - 6 - 3i - 16i - 8(- 1)

= - 6 - 3i - 16i + 8 ← collect like terms

= 2 - 19i

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The number of dogs in a shelter is equal to 4 less than 2 times the number of cats. If there are 20 dogs in the shelter how many cats are there?

Answers

d=number of dogs
c=cats

d equals 4 less than 2 times c
d=-4+2c
20 dogs
d=20
subsitute
20=-4+2c
add 4
24=2c
divide 2
12=c
12 cats

Please help due tomorrow

Answers

Answer:

we can't even see it

Step-by-step explanation:

it's very blurry

Please help me on this will give you brainliest

Answers

Answer:

876

Step-by-step explanation:

since i helped can i have brainlist please :D

What is the solution of the system of equations?6x – 2y = 4
–9x + 3y = 12

infinitely many solutions
no solution
(0, –2)
(–2, 4)

Answers

Hello,
Answer B: no solution

6x-2y=4 (1)
-9x+3y=12 (2)

9*(1)+6*(2)==>0y=108
==> no solution

There are 12 students in a classroom, including the triplets joey, chloe, and zoe. If 3 of the 12 are randomly selcted to give speeches, what is the probability that joey with be first, chloe will be second, and zoe will be third?A: 1/1320 B: 1/4 C: 1/48 D: 1/220

Answers

The probability of choosing Joey first is 1/12 .

If that happens, the probability of choosing Chloe next is 1/11 .

Then, the probability of choosing Zoe after that is 1/10 .

The probability of all these things happening is

(1/12) x (1/11) x (1/10)

= 1/1320 = 0.00076 = 0.076 percent

Round 7 3/7 to the nearest whole number.