1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
telo118 [61]
3 years ago
15

For a scientific experiment, a physicist must make sure that the temperature of a metal does not get colder than −78 °C. The phy

sicist changes the metal's temperature at a steady rate of −3 °C per hour.
Let t represent temperature in degrees Celsius. Enter an inequality. Use the fact that the rate of change in temperature times the number of seconds equals the final temperature.


Solve the inequality in the first part. How long will it take the physicist to change the temperature of the metal?


The physicist has to repeat the experiment if the metal gets cooler than −78 °C. How many hours would the physicist have to cool the metal for this to happen?
Mathematics
1 answer:
igor_vitrenko [27]3 years ago
4 0
-3t < -78 
÷-3      ÷-3
_________
t > 26

78÷26=3
You might be interested in
Sydney has a bag of stuffed animals containing, 1 elephant, 4 bears, 3 cats, and 2 dogs. If she randomly selects 1 stuffed anima
torisob [31]

Answer:

2/15

Step-by-step explanation:

Step one:

given data

sample space

1 elephant,

4 bears,

3 cats, and

2 dogs.

sample size= 1+4+3+2= 10

Required:

By selecting without replacement, the probability that she chooses a bear both times

Step two:

the first event= Pr(bear)= 4/10= 2/5

the second event, the sample size is now 9 and the number of bears is now 3

Pr(bear)= 3/9= 1/3

Hence, the probability that she chooses a bear both times

= 2/5*1/3

=2/15

3 0
3 years ago
What is the precent of 2 is 8?
Vlad [161]
2 * x/100 = 8

x/100 = 4

x = 400

400%
3 0
3 years ago
a lab uses negative numbers to describe a car moving backward on a road if the car was at -75.5 feet ,went forward 23 feet and t
never [62]
Did you that that God loves you and wants the best for you
6 0
3 years ago
Is this right? IDK I need help!!!
True [87]

Answer:

um... you are wrong

Step-by-step explanation:

its the the last one

you can't add when its division

you can change exponents from 1/x^-2

to   x^2

<h2><em><u>I nweed brainliest</u></em></h2>
5 0
3 years ago
An equation that passes through (0, -2/3) and (-3, -2/3)
9966 [12]

Answer:

y = 0x - 2/3

Step-by-step explanation:

We are asked to find the equation of the line

Step1: find the slope

( 0 , -2/3) ( 3 , -2/3)

m = (y_2 - y_1 )/ (x_2 - x_1)

x_1 = 0

y_1 = -2/3

x_2 = 3

y_2 = -2/3

Insert the values into the equation

m =( -2/3 - (-2/3) / (3 - 0)

= -2/3 + 2/3 / 3

= 0 / 3

m = 0

Step 2: sub m into the equation

y = mx + c

y = 0x + c

Step 3: sub any of the two points given into the eqn

y = 0x + c

Let's pick ( 3 , -2/3)

x = 3

y = -2/3

-2/3 = 0(3) + c

-2/3 = 0 + c

c = -2/3

Step4: sub c into the equation

y = mx + c

y = 0x + c

y = 0x - 2/3

Therefore, the equation of the line is

y = 0x - 2/3

8 0
3 years ago
Other questions:
  • A horse is tied with rope in the center of grassland to graze. The length of the rope is 5m. The diameter of the circular garden
    15·1 answer
  • Please help me out fast(:
    7·1 answer
  • Which of the following operations always produces a positive an answer
    15·1 answer
  • The Kamp family has twins, Rob and Rachel. Both Rob and Rachel graduated from college 2 years ago, and each is now earning $50,0
    9·1 answer
  • What is 4y-x+7+5y+3x-9
    9·1 answer
  • 6. Y(3.5, 1), Z(-4, 2.5)<br> Please help
    14·1 answer
  • PLEASE HELP!!!!! 1.) Line a passes through points (-2, 1) and (2, 9). Write an equation in slope intercept form that is parallel
    7·2 answers
  • Pls help I need a good grade
    13·1 answer
  • Use the method of your choice to solve the following system of equations. Write your solution as a coordinate.
    8·1 answer
  • a ladder 15 feet tall is placed 7 feet from a building that is perpendicular to the ground. how tall is the building?
    9·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!