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zhannawk [14.2K]

3 years ago

6

A scientist wants a 45 milliliter saline solution with a concentration of 11%. She has concentrations of 7% and 19%. How much of

each solution must she use to get the desired concentration?

1 answer:

olchik [2.2K]3 years ago

5 0

Hhu frfr fggh agh agh

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If 8a+2b+7c=4 what is -7c–

Mandarinka [93]

$8a+2b+7c=4\ \ \ \ |-7c\\\\8a+2b=4-7c\ \ \ \ |-4\\\\8a+2b-4=-7c\\\\\boxed{-7c=8a/-2b-4}$

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4 years ago

Use the figure below to complete the following problem

yarga [219]

Answer:

60

Step-by-step explanation:

<H + <T = 180

2x+ 60 + x + 30 = 180

3x + 90 = 180

3x = 90

x = 30

<T = x + 30 = 30 + 30 = 60

Answer

<T = 60

6 0

4 years ago

Z=2+5i. Convert the complex number to trigonometric form.

morpeh [17]

Answer:

$z = \sqrt{29} ( \cos \: 68 \degree + i \sin 68 \degree)$

Step-by-step explanation:

The trigonometric form of complex numbers is when the complex number is in polar form.

This is given by

$z = r( \cos \theta + i \sin \theta)$

where the modulus r is given by

$r = \sqrt{{2}^{2} + {5}^{2} }$

$r = \sqrt{4 + 25}$

$r = \sqrt{29}$

and the argument is given by

$\theta = \tan \:^{ - 1} ( \frac{y}{x})$

$\theta = \tan \:^{ - 1} ( \frac{5}{2})$

$\theta = 68 \degree$

The trigonometric form then becomes:

$z = \sqrt{29} ( \cos \: 68 \degree + i \sin 68 \degree)$

4 0

3 years ago

What’s the answer??????

Lera25 [3.4K]

Answer:

-131,072

Step-by-step explanation:

a(n)=an-1*-4

128=a(4)

128*-4*4*-4*-4*4=-131072.

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3 years ago

What is an easy method to workout 35% of 70

dimulka [17.4K]

Step-by-step explanation:

$70 \times \frac{35}{100} = 24 .5$

7 0

3 years ago

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