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geniusboy [140]
3 years ago
11

Please help me *30 points*

Mathematics
2 answers:
sasho [114]3 years ago
7 0

Answer:

number 1 is         -1.5

number 2 is       -2 1/6

Step-by-step explanation

sleet_krkn [62]3 years ago
3 0

1.

The fraction on the left side is a division equation, so the inverse operation would be multiplication.

Multiply both sides by 5:

n/5 = -0.3

n = -0.3 x 5

n = -1.5

2. The equation on the left side is multiplication, the inverse operation would be division. Divide both sides by -2:

n = 4 1/3 / -2

n = -2 1/6

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Step-by-step explanation:

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Read 2 more answers
In 1990 the average family income was about $ 39 , 000 , and in 2010 it was about $ 70 , 768 . Let x = 0 represent 1990, x = 1 r
iren2701 [21]

Answer:

<em />f(x) = 1588.4x + 39000<em />

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Step-by-step explanation:

Given

In 1990; Income= $39000

In 2010; Income= $70768

Solving (a): An equation in form of f(x) = ax + b

First, we need to determine the slope, a

a = \frac{y_2 - y_1}{x_2 - x_1}

Taking y as income and x as year index.

When x = 0; y = 39000

When x = 20; y = 70768

Substitute these values in the above formula

a = \frac{70768 - 39000}{20 - 0}

a = \frac{31768}{20}

a = 1588.4

Next, is to determine the formula using:

y - y_1 = a(x - x_1)

<em>Considering :When x = 0; y = 39000, we have</em>

<em />y - 39000 = 1588.4(x - 0)<em />

<em />y - 39000 = 1588.4x<em />

<em>Make y the subject of formula</em>

<em />y = 1588.4x + 39000<em />

<em />

<em>Express y as a function of x</em>

<em />f(x) = 1588.4x + 39000<em />

Solving (b): Income in 2005

<em>In 2005, x = 15</em>

So:

f(x) = 1588.4x + 39000 becomes

f(15) = 1588.4 * 15 + 39000

f(15) = 62826

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3 years ago
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Answer:

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solong [7]

Answer:

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Step-by-step explanation:

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