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3 years ago

I need help with this question

Mathematics

1 answer:

MatroZZZ [7]3 years ago

5 0

The sequence of keystrokes directs the calculator to compute

$\dfrac{5\cdot 10^{-9}}{2\cdot 10^4}=\dfrac{5}{2}\cdot 10^{(-9-4)}=2.5\cdot 10^{-13}$

The display will read ...

... A) 2.5E-13

_____

You can enter these keystrokes on your calculator and get the answer immediately.

___

Actually, it is very likely Samuel's calculator displayed 2E4, since the key for "=" has not been pressed.

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Chelsea wrote several equations and determined that only one of the equations has exactly one solution. Which of these

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Step-by-step explanation:

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3 years ago

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:)Which number line best shows how to solve -4 -(-6)?

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Answer:

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Step-by-step explanation:

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3 years ago

How to find minimum and maximum of this equation.

Westkost [7]

Using it's vertex, the maximum value of the quadratic function is -3.19.

<h3>What is the vertex of a quadratic equation?</h3>

A quadratic equation is modeled by:

$y = ax^2 + bx + c$

The vertex is given by:

$(x_v, y_v)$

In which:

$x_v = -\frac{b}{2a}$

$y_v = -\frac{b^2 - 4ac}{4a}$

Considering the coefficient a, we have that:

If a < 0, the vertex is a maximum point.

If a > 0, the vertex is a minimum point.

In this problem, the equation is:

y + 4 = -x² + 1.8x

In standard format:

y = -x² + 1.8x - 4.

The coefficients are a = -1 < 0, b = 1.8, c = -4, hence the maximum value is:

$y_v = -\frac{1.8^2 - 4(-1)(-4)}{4(-1)} = -3.19$

More can be learned about the vertex of a quadratic function at brainly.com/question/24737967

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2 years ago

You plan to go skiing this weekend in Tennessee. The ski resort charges $18.50 per hour in addition to a $100 deposit to rent sk

Rina8888 [55]

Answer:

Part a) $y=18.50x+100$

Part b) The total cost is $\$220.25$

Part c) see the explanation

Step-by-step explanation:

Part a) Write a linear equation to represent this situation

Define the variables

Let

x ----> the number of hours

y ----> the total cost in dollars

we know that

The linear equation in slope intercept form is equal to

$y=mx+b$

where

m is the slope or the unit rate

b is the y-intercept or initial value (value of y when the value of x is equal to zero)

In this problem we have that

The unit rate or slope is equal to

$m=\$18.50\ per\ hour$

The y-intercept or initial value is equal to

$b=\$100$

substitute

$y=18.50x+100$

Part b) Use the equation to find the total cost to rent skis from 8:30 am to 3:00 pm

Remember that

3:00 pm=15:00

from 8:30 am to 3:00 pm, the total hours is equal to

15:00 -8:30=6:30=6.5 h

For x=6.5 h

substitute in the linear equation and solve for y

$y=18.50(6.5)+100\\y=\$220.25$

Part c) What does your answer mean in context of the problem?

we have that

y=220.25

That means -----> The total cost to rent skis for 6.5 hours is equal to $220.25

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3 years ago

In the reaction 2HgO(s) --> 2Hg(l) + O2(g) we measure the evolution of gas to determine the rate of reaction. At the beginnin

djverab [1.8K]

Answer:

0.034 L/min

Step-by-step explanation:

The rate of reaction is the volume change (ΔV) divided by the time(t) and divided by the coefficient of the compound in the reaction. The coefficient of O₂ is 1, so:

R = (0.36 - 0.02)/10

R = 0.034 L/min

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3 years ago