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3 years ago

Here’s the other one :)

Mathematics

2 answers:

Naddik [55]3 years ago

4 0

I believe the answer is 2(15t).

devlian [24]3 years ago

4 0

Answer:

15 x t hours x 2

Step-by-step explanation:

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Can someone please help me with 1 and 2 :)

raketka [301]

Answer:

1. {(2, 7), (1, 3), (0, -5), (-1, -2)}

2. {(1, -1), (-1, 0), (-3, -5), (-9, 2)}

Step-by-step explanation:

Inverse means finding the opposite so basically all you have to do is write the opposite of lets say -3 which is +3.

3 0

3 years ago

Divide £208 in the ratio 3:1<br><br> How do I do this??

inysia [295]

Answer:

s = r1 s = 3.1 s = 3.1

v =a/s

v = 208/3.1

v = 67.0968

Step-by-step explanation:

3 0

3 years ago

Evaluate <br> 4x3x8-2x(8x5-37)

Zigmanuir [339]

Answer:

$4x^1^1-16x^6+74x$

Step-by-step explanation:

7 0

3 years ago

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

3 years ago

Which number is equivalent to 7/8

PtichkaEL [24]

Answer:

78 is 7 divided by 8, which equals 0.875. So an equivalent fraction is another fraction that also equals 0.875.

6 0

3 years ago