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Juliette [100K]
2 years ago
8

2. Write (2+5i)(3-1) as a complex number in standard form a+bi. real part + imaginary part

Mathematics
1 answer:
Burka [1]2 years ago
5 0

Answer:4+10i

Step-by-step explanation:

6+15i-2-5i

4+10i

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If a1=7 and an=an-1+5 than find the value of a5<br><br> ​<br> .
Katyanochek1 [597]

Answer:

a₅=27.

Step-by-step explanation:

1) according to the condition the given subsequence is arithmetic sequence. It means, the a₁=7 and d=5, then

2) a₅=a₁+4*d; => a₅=7+4*5=27.

4 0
2 years ago
Jimmy set his score for his math test. After the math teacher returnee his paper to him, he realized that if he increased his ta
mixer [17]
When ever you have percentages, it should be helpful to bear in mind you can express them as multipliers. In this case, it will be helpful.
So, if we let:
a = test score
b = target score
then, using the information given:
a = 1.1b + 1
a = 1.15b - 3
and we get simultaneous equations.
'1.1' and '1.15' are the multipliers that I got using the percentages. Multiplying a value by 1.1 is the equivalent of increasing the value by 10%. If you multiplied it by 0.1 (which is the same as dividing by 10), you would get just 10% of the value.
Back to the simultaneous equations, we can just solve them now:
There are a number of ways to do this but I will use my preferred method:
Rearrange to express in terms of b:
a = 1.1b + 1
then b = (a - 1)/1.1
a = 1.15b - 3
then b = (a + 3)/1.15
Since they are both equal to b, they are of the same value so we can set them equal to each other and solve for a:
(a - 1)/1.1 = (a + 3)/1.15
1.15 * (a - 1) = 1.1 * (a + 3)
1.15a - 1.15 = 1.1a + 3.3
0.05a = 4.45
a = 89

8 0
3 years ago
The population of Wakanda is 5231281. Wakanda is about 70323 square miles. What is the population density of Wakanda? Round your
Mila [183]
5.231.281 : 70.323 = 74,3 people per square mile
or 74 people per square mile
7 0
2 years ago
Which has the same solution as 2(x+4)= -7 -3x
Butoxors [25]
I hope this helps you



2x+8= -7-3x



5x= -15


x= -3
7 0
3 years ago
1 year and 240 days into ratio and reduced into the simplest form​
tatuchka [14]

Refer to the attachment please :-)

6 0
2 years ago
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