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4 years ago

Please help me find y and show work/steps. I don't know how to do it

Mathematics

2 answers:

trasher [3.6K]4 years ago

5 0

We will check if y and 60cm are parallel.

If the lengths 28cm, 56cm and 15cm, 30cm are in proportion, then y and the segment 60cm are parallel.

$\dfrac{56}{28}=\dfrac{30}{15}\\\\2=2\qquad CORRECT!$

OK. We know: y and 60cm are parallel. Therefore we have equation:

$\dfrac{y}{28+56}=\dfrac{60}{56}\\\\\dfrac{y}{84}=\dfrac{15}{14}\qquad|\text{cross multiply}\\\\14y=15\cdot84\qquad|\text{divide both sides by 14}\\\\y=90cm$

<h3>Answer: y = 90 cm.</h3>

geniusboy [140]4 years ago

4 0

I got like that my best

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In the diagram, m∠COE = 55°. If m∠2 = 2x and m∠3 = x + 10, what is the measure of angle 2?

Rasek [7]

The answer is 30 degrees option b

4 0

3 years ago

Simplify -6i(8-6i)(-8-8i)

padilas [110]

Answer:

-96 + 672\,i

Step-by-step explanation:

This is a product of complex numbers, so we have in mind not only the general rules for multiplying binomials, but also the properties associated with the powers of the imaginary unit "i", in particular $i^2=-1$

We start by making the first product indicated which is that of a pure imaginary number (-6i) times the complex number (8-6i). We use distributive property and obtain the new complex number that results from this product:

$-6\,i\,(8-6\,i)= (-6\,i)\,* 8 \, -\,6\,i\,(-6\,i)=-48\,i+36\,i^2=-48\,i+36\,(-1)=-36-48\,i$

Now we make the second multiplication indicated (using distributive property as one does with the product of binomials), and combine like terms at the end:

$(-36-48\,i)\,(-8-8\.i)=(-36)\.(-8)+(-36)(-8\,i)+(-48\,i)\,(-8)+(-48\,i)(-8\,i)=\\=288+288\,i+384\,i+384\,i^2=288+288\,i+384\,i+384\,(-1)=\\=288-384+288\,i+384\,i=-96+672\,i$

5 0

4 years ago

X3= one over eight what's the answer for that?

Black_prince [1.1K]

X^3 = 1/8
x^3 = (1/2)^3
x = 1/2

hope it helps

6 0

3 years ago

Someone please help me <br> serious answers only!!!!

madam [21]

Hello!

We will plug in each ordered pair into the equation and see if it works.

A)
0=-9(0)
0=0
True

B)
18=-9(-2)
18=18
True

C)
-9=-9(-1)
-9≠9
False

D)
-27=-9(-3)
-27≠27
False

E)
-18=-9(2)
-18=-18
True

F)
36=-9(4)
36≠-36
False

You answers are A, B, and E.

I hope this helps!

6 0

3 years ago

1 <br> 2<br> 3<br> 66<br> 84<br> 3<br> 43<br> I need help

Alex787 [66]

Answer:

m<1 = 30 degrees

m<2= 41 degrees

m<3= 96 degrees

Step-by-step explanation:

Hope this helps :)

Pls give brainliest, I really need it

- massmaster34

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4 years ago