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3 years ago

I need help i dont understand this

Mathematics

1 answer:

Nata [24]3 years ago

5 0

Answer:

Step-by-step explanation:

Given the 2 equations

4x + 8y = 21 → (1)

y = - $\frac{1}{2}$ x + 3 → (2)

Substitute y = - $\frac{1}{2}$ x + 3 into (1)

4x + 8(- $\frac{1}{2}$ x + 3 ) = 21 ← distribute parenthesis on left side

4x - 4x + 24 = 21 ( subtract 24 from both sides )

0 = - 3 ← not possible

This indicates the system has no solutions

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Answer:

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Step-by-step explanation:

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3 years ago

A light bulb consumes 15300 watt-hours in 4 days and 6 hours . How many watt-hours does it consume per day?

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2 years ago

Suppose ABC is a right triangle with sides a, b, and c and right angle at C. Find the unknown side length using the Pythagorean

Leno4ka [110]

Answer:

a = $\sqrt{7}$

Step-by-step explanation:

I think your question is missed of key information, allow me to add in and hope it will fit the original one.:

<em>Suppose ABC is a right triangle with sides a, b, and c and right angle at C. Find the unknown side length using the Pythagorean theorem and then find the values of the six trigonometric functions for angle B. when b=3 and c=4</em>.

My answer:

We will Pythagoras theorem, which states that the sum of squares of two legs of a right triangle is equal to the square of the hypotenuse of right triangle. Because the question says that ABC is a right triangle.

$a^2+b^2=c^2$

Given that: b=3 and c=4

$a^2+3^2=4^2a^2+9=16a^2+9-9=16-9a^2=7$

so a = $\sqrt{7}$

We know that tangent relates opposite side of a right triangle with adjacent side.

$\text{tan}(B)=\frac{a}{b}\\\text{tan}(B)=\frac{\sqrt{7}}{3}$

Please have a look at the attached photos.

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4 years ago

What is the domain and range of the graph?

GREYUIT [131]

Answer:

Domain (0, ∞)

Range (-∞, ∞)

Step-by-step explanation:

The domain is the input values

The input is from 0 to infinity

Domain (0, ∞)

The range is the output values

The input is from negative infinity to infinity

Range (-∞, ∞)

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3 years ago

I need help i dont understand this​

I need help i dont understand this