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3 years ago

Answer urgent please!!

Mathematics

1 answer:

butalik [34]3 years ago

4 0

Answer:

Step-by-step explanation:

$u=5i-j\\\\v=3i+j\\\\w=i+4j\\$

$v+w$

$3i+j+i+4j\\\\4i+5j\\\\u*(v+w)\\\\(5i-j)(4i+5j)\\\\20-5\\\\\boxed{15}$

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Which choice is equivalent to the expression below √-81

garri49 [273]

Answer:

Step-by-step explanation:

$\sqrt{-81}$ is the same as $\sqrt{81}$ · $\sqrt{-1}$

This can be simplified to 9 · $\sqrt{-1}$

And the square root of -1 is i,

so this equals 9i

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4 years ago

WILL MARK BRAINLIEST

DanielleElmas [232]

Answer:

1 and 4

Step-by-step explanation:

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3 years ago

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#5.Color Number of Pieces

IRISSAK [1]

Answer:

6. B

7. D

Step-by-step explanation:

For 6 found that the 56 pieces in the first bag was about 18% of that bag. So then I found that 18% of 450 is ruffly 84, so B

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3 years ago

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Find the vertex of the parabola. y = -4x2 - 16x - 11

emmasim [6.3K]

The standard equation is y=ax^2+bx+k and the vertex way is y=a(x-h)(x-h)+x
so the coordinate for x is -b/2a, for your problem a=-4 b=-16 so the coordinate for x is -(-16)/(2*(-4))=-2. Now you have to replace x=-2 in your equation y=-4(-2)^2-16(-2)-11= 5.
The vertex is (-2, 5)

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4 years ago

a hiking path is represented by the equation y=3/8x on a coordinate map. The county would like to create a parallel path for bik

stepladder [879]

Answer:

The equation of the bike path on a coordinate map is represented by $y = \frac{3}{8}\cdot x +1$ .

Step-by-step explanation:

From Analytical Geometry, we know that resultant parallel line is a translated version of parent line. Two lines are parallel to each other when they share the same slope. The resultant line can be construted from slope-point form:

$y-y_{o} = m_{\parallel}\cdot (x-x_{o})$

Where:

$x_{o}$ , $y_{o}$ - Components of known point, dimensionless.

$m_{\parallel}$ - Slope of the parallel line, dimensionless.

In addition, a line has also this form:

$y = m\cdot x + b$

Where:

$x$ - Independent variable, dimensionless.

$y$ - Dependent variable, dimensionless.

$m$ - Slope, dimensionless.

$b$ - y-Intercept, dimensionless.

Given that parent function is $y = \frac{3}{8}\cdot x$ , the slope of the resulting line is $m_{\parallel} = \frac{3}{8}$ . Now, if $x_{o} = 16$ and $y_{o} = 7$ , we obtain the equation of the line:

$y-7 = \frac{3}{8}\cdot (x-16)$

$y = \frac{3}{8}\cdot x +1$

The equation of the bike path on a coordinate map is represented by $y = \frac{3}{8}\cdot x +1$ .

3 0

4 years ago