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RoseWind [281]
3 years ago
14

Please help for #4 (an explanation would be great)

Mathematics
2 answers:
PtichkaEL [24]3 years ago
8 0

Answer:

15i√6

Step-by-step explanation:

5√(54)(-1) = 5√(9)(6)(-1) = 5(3)i√6 = 15i√6

Margarita [4]3 years ago
4 0

Answer:

-36.7

Step-by-step explanation:

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Someone please help me thank you
german

Answer:

4

Step-by-step explanation:

7x = x² - 8

=> x² - 7x - 8 = 0

use quadratic formula:

a = 1, b = -7, c = -8

x = \frac{-(1)±\sqrt{(-7)^{2} - 4(1)(-8) } }{2(1)} <em>(pls ignore the "A" I don't know why it's showing up)</em>

=> x = \frac{-1±\sqrt{49 + 32} }{2}

=> x = \frac{-1±9 }{2}

=> x = \frac{-1 +9}{2} = 4 or \frac{-1-9}{2} = -5 <em>(the answer is only 4 since it's asking for the positive solution)</em>

6 0
3 years ago
Read 2 more answers
The circumference (C) of a circle is 16 cm. Which formula can you use to find the diameter (d) if you know that C = πd?
elixir [45]
Okay i'm confused on the question but i do know the answer of the diameter
 if that help the diameter would be d=5.09cm
i hope this helps 
5 0
3 years ago
Read 2 more answers
A girl weighs 5/8 as much as her brother does. If the girl weighs 110 lb, how much does her brother weigh?
fomenos
Brother's weight * 5/8 = 110
Brother's weight * 5/8÷5/8 = 110÷ 5/8
Brother's weight = 176



7 0
3 years ago
Read 2 more answers
MZJ and m M are base angles of isosceles trapezoid JKLM. If mZJ = 18x + 8 and m_M=11x + 15 find m2K.
maxonik [38]

The question is incomplete. Here is the complete question.

m∠J and m∠Kare base angles of an isosceles trapezoid JKLM.

If m∠J = 18x + 8, and m∠M = 11x + 15 , find m∠K.

A. 1

B. 154

C. 77

D. 26

Answer: B. m∠K = 154

Step-by-step explanation: <u>Isosceles</u> <u>trapezoid</u> is a parallelogram with two parallel sides, called Base, and two non-parallel sides that have the same measure.

Related to internal angles, angles of the base are equal and opposite angles are supplementary.

In trapezoid JKLM, m∠J and m∠M are base angles, so they are equal:

18x + 8 = 11x + 15

7x = 7

x = 1

Now, m∠K is opposite so, they are supplementary, which means their sum results in 180°:

m∠J = 18(1) + 8

m∠J = 26

m∠K + m∠J = 180

m∠K + 26 = 180

m∠K = 154

The angle m∠K is 154°

7 0
3 years ago
Divide 28 cans of soda into two groups so the ratio is 3 to 4<br>to
Brums [2.3K]
28 = 3x+4x 
x = 4 

3x = 12 
4x = 16 
12:16 = 3:4
6 0
3 years ago
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