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Inessa [10]
4 years ago
5

PLZZZ I NEED HELPPPPPP 4x-5=-8 solve for x plz help and show work I really want to know how to do it

Mathematics
1 answer:
nignag [31]4 years ago
4 0

Answer:

x= 3.25

Step-by-step explanation:

Lets start off by writing the equation: 4x-5=-8

next you subtract 5 from both sides

then you will get: 4x=-13

next you will divide 4 from both sides to isolate x and what is equal to x

then you get your answer :)

4x-5=-8

4x-5=-8\\    -5        -5

4x=-13

\frac{4x=-13}{4}

x = -3.25

i hope this helps luv :)

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D) change decimal to a fraction 0.078125.​
Y_Kistochka [10]

pls follow me

Step-by-step explanation:

not sure but I think the answer is 5/64

8 0
3 years ago
Read 2 more answers
4. Using the geometric sum formulas, evaluate each of the following sums and express your answer in Cartesian form.
nikitadnepr [17]

Answer:

\sum_{n=0}^9cos(\frac{\pi n}{2})=1

\sum_{k=0}^{N-1}e^{\frac{i2\pi kk}{2}}=0

\sum_{n=0}^\infty (\frac{1}{2})^n cos(\frac{\pi n}{2})=\frac{1}{2}

Step-by-step explanation:

\sum_{n=0}^9cos(\frac{\pi n}{2})=\frac{1}{2}(\sum_{n=0}^9 (e^{\frac{i\pi n}{2}}+ e^{\frac{i\pi n}{2}}))

=\frac{1}{2}(\frac{1-e^{\frac{10i\pi}{2}}}{1-e^{\frac{i\pi}{2}}}+\frac{1-e^{-\frac{10i\pi}{2}}}{1-e^{-\frac{i\pi}{2}}})

=\frac{1}{2}(\frac{1+1}{1-i}+\frac{1+1}{1+i})=1

2nd

\sum_{k=0}^{N-1}e^{\frac{i2\pi kk}{2}}=\frac{1-e^{\frac{i2\pi N}{N}}}{1-e^{\frac{i2\pi}{N}}}

=\frac{1-1}{1-e^{\frac{i2\pi}{N}}}=0

3th

\sum_{n=0}^\infty (\frac{1}{2})^n cos(\frac{\pi n}{2})==\frac{1}{2}(\sum_{n=0}^\infty ((\frac{e^{\frac{i\pi n}{2}}}{2})^n+ (\frac{e^{-\frac{i\pi n}{2}}}{2})^n))

=\frac{1}{2}(\frac{1-0}{1-i}+\frac{1-0}{1+i})=\frac{1}{2}

What we use?

We use that

e^{i\pi n}=cos(\pi n)+i sin(\pi n)

and

\sum_{n=0}^k r^k=\frac{1-r^{k+1}}{1-r}

6 0
4 years ago
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Radda [10]

Answer:

9ab/8

Step-by-step explanation:

-3/4 a * -3/2 b

negative time negative is positive

3*3/(4*2) ab

9ab/8

we can make the number a mixed number but it is not usually done

(1 1/8 ) * ab




6 0
3 years ago
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artcher [175]

Answer:

1

Step-by-step explanation:

7 0
3 years ago
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irina [24]

Answer:

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