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arlik [135]
3 years ago
13

What is i^30? A. -i B. -1 C. i D. 1​

Mathematics
2 answers:
Mariulka [41]3 years ago
8 0

Answer:

B

Step-by-step explanation:

i^{30} = i^{2*15} = (i^{2})^{15}=(-1)^{15} = -1

tresset_1 [31]3 years ago
7 0

Answer:

B

Step-by-step explanation:

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Tracy used mental math to find 7×38 as shown below. what is x? 7×38 = 7(40-2) = 7(x)- 7(2)​
qaws [65]

Answer:

x=40

Step-by-step explanation:

subtract first then multiply

7*38=7x-14

move terms 266=7x-14

calculate-7x=-14-266

divide both sides by -7 (-7x=-280)

solution x=40

4 0
3 years ago
Use trigonometry to solve the triangle shown. Round all side lengths to one decimal place and
Eddi Din [679]

Answer/Step-by-step explanation:

Recall: SOH CAH TOA

✔️Find <A:

Reference angle (θ) = A

Opposite side = 14 cm

Hypotenuse = 20 cm

Apply SOH:

Sin θ = Opp/Hyp

Substitute

Sin A = 14/20

A = sin^{-1}(\frac{14}{20})

m<A = 44° (nearest whole number)

✔️Find <C:

Reference angle (θ) = C

Adjacent side = 14 cm

Hypotenuse = 20 cm

Apply CAH:

Cos θ = Adj/Hyp

Substitute

Cos C = 14/20

C = cos^{-1}(\frac{14}{20})

m<C = 46° (nearest whole number)

✔️Find AB:

Reference angle (θ) = C = 46°

Opposite side = AB

Hypotenuse = 20 cm

Apply SOH:

Sin θ = Opp/Hyp

Sin 46° = AB/20

20*Sin 46° = AB

AB = 14.4 cm (one decimal place)

3 0
3 years ago
Solve -3+12-5(2y-7) The solution y is:
jolli1 [7]

Answer:

+12

Step-by-step explanation:

1. distribute the negative 5 to 2y and negative 7

2. combine like term's -3+12-10y+35

3.Get the Y value by itself -44 from both sides -44-2y=

                                                                             -44         -44

4. divide negative 2 from both sides<u> 2y</u>=<u>-44</u>

                                                            -2= -2

8 0
3 years ago
I made up this question please explain this to me in detail explanation I am trying to understand Triangle Similarity what would
larisa86 [58]

Good evening ,

Look at the photo below for the answer.

:)

3 0
3 years ago
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Brad wants the buy flowers for his friend with 27$. the daises are 1$ each and the roses 3$ each. He buys 3 more daises more tha
Alona [7]
3$ x 6 roses = 18$
1$ x  9 daisies = 9$

18 + 9 = 27$

Answer. 6 roses
8 0
3 years ago
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