All categories

3 years ago

Can someone plz help thxs

Mathematics

1 answer:

emmasim [6.3K]3 years ago

4 0

Sheeeeeeessssssshhhhhhhh

You might be interested in

Write the slope-intercept form of the equation of the line through the point (-1,-4) with the slope of 6.

igomit [66]

Answer:

y-y1=m(x-x1)

y+4=6(x+1)

y=6x+2

4 0

3 years ago

In which figure is point G an orthocenter ?

Papessa [141]

None of the above.
The orthocenter is the point where the three altitudes meet. An altitude is the line from one vertex perpendicular to the opposite side.

4 0

3 years ago

Read 2 more answers

Suppose an unknown radioactive substance produces 8000 counts per minute on a Geiger counter at a certain time, and only 500 cou

mariarad [96]

Answer:

The half-life of the radioactive substance is of 3.25 days.

Step-by-step explanation:

The amount of radioactive substance is proportional to the number of counts per minute:

This means that the amount is given by the following differential equation:

$\frac{dQ}{dt} = -kQ$

In which k is the decay rate.

The solution is:

$Q(t) = Q(0)e^{-kt}$

In which Q(0) is the initial amount:

8000 counts per minute on a Geiger counter at a certain time

This means that $Q(0) = 8000$

500 counts per minute 13 days later.

This means that $Q(13) = 500$ . We use this to find k.

$Q(t) = Q(0)e^{-kt}$

$500 = 8000e^{-13k}$

$e^{-13k} = \frac{500}{8000}$

$\ln{e^{-13k}} = \ln{\frac{500}{8000}}$

$-13k = \ln{\frac{500}{8000}}$

$k = -\frac{\ln{\frac{500}{8000}}}{13}$

$k = 0.2133$

$Q(t) = Q(0)e^{-0.2133t}$

Determine the half-life of the radioactive substance.

This is t for which Q(t) = 0.5Q(0). So

$Q(t) = Q(0)e^{-0.2133t}$

$0.5Q(0) = Q(0)e^{-0.2133t}$

$e^{-0.2133t} = 0.5$

$\ln{e^{-0.2133t}} = \ln{0.5}$

$-0.2133t = \ln{0.5}$

$t = -\frac{\ln{0.5}}{0.2133}$

$t = 3.25$

The half-life of the radioactive substance is of 3.25 days.

7 0

3 years ago

A scientist invents a car that can travel for many hours without stopping for fuel. The car travels around a track at 51 miles a

EleoNora [17]

Well 51 per hour and there is 24 hours so you just multiply the two together. Which you would get get 1,224 Miles

4 0

3 years ago

Read 2 more answers

Which is the value of the discriminant for the quadratic equation 0=x+2+x^2

solong [7]

0 = x + 2 + x^2
x^2 + x + 2 = 0
a = 1, b = 1, c = 2

discriminant = b^2 - 4ac = 1^2 - (4 x 1 x 2) = 1 - 8 = -7

7 0

4 years ago