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3 years ago

What is the discriminant of the equation -4.9t^2+6.1t-0.8=0

Mathematics

1 answer:

vlabodo [156]3 years ago

8 0

$\sqrt{6.1^2-4*-4.9*-0.8}$ ≈ 4.64

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Jake washes cars. On monday he washed 18 cars for $90. On tuesday he washed 9 cars for $45. On wednesday he washed 12 cars for $

chubhunter [2.5K]

Answer:

the rate of change is 5

Step-by-step explanation:

$90 / 18 cars = $5 per car

$45 / 9 cars = $5 per car

$60 / 12 cars = $5 per car

That means the rate of change is 5 (5/1)

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3 years ago

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11. What is the value of x in the figure at the right? (Examples 3 and 4)

natka813 [3]

Answer:

x = 11

Step-by-step explanation:

Vertically opposite angles are equal
Angles around a point add up to 360°

Therefore, $15x + 15x + 15 + 15 = 360$

$\implies 30x+30=360$

$\implies 30x=330$

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6 0

3 years ago

The slope-intercept form given (6,-5) & perpendicular to -5x - 7y = -17.

tatuchka [14]

Answer:

$y=\dfrac{7}{5}x-\dfrac{67}{5}$

Step-by-step explanation:

Slope-intercept form of a linear equation:

$y=mx+b$

where:

m is the slope.
b is the y-intercept.

Rearrange the given equation so that it is in slope-intercept form:

$\implies -5x-7y=-17$

$\implies -7y=5x-17$

$\implies y=-\dfrac{5}{7}x+\dfrac{17}{7}$

Therefore, the slope of the given equation is -⁵/₇.

If two lines are perpendicular to each other (at right angles), the product of their slopes will be -1. Therefore, their slopes will be negative reciprocals of each other.

Therefore, the slope of the line perpendicular to the given equation is:

$\sf m=\dfrac{7}{5}$

Substitute the found slope and the given point (6, -5) into the slope-intercept formula and solve for b:

$\implies -5=\dfrac{7}{5}(6)+b$

$\implies -5=\dfrac{42}{5}+b$

$\implies b=-\dfrac{67}{5}$

Substitute the found slope and the found value of b into the slope-intercept formula to create the equation for the perpendicular line:

$\implies y=\dfrac{7}{5}x-\dfrac{67}{5}$

Learn more about slope-intercept form here:

brainly.com/question/27317293

brainly.com/question/27926846

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1 year ago

PLS HELP WITH THIS I WILL GIVE BRANLY

KIM [24]

Answer:

21 degrees is the answer

Step-by-step explanation:

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3 years ago

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Help before 9:00 1 problem at a time Thank

adelina 88 [10]

I only know number 3.Number 3 is choice c/9 because you add all the numbers Carolina wrote.The divide the total by the number of numbers there are which is 5.So you would do 45÷5 which equals 9.

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3 years ago

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