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kumpel [21]
3 years ago
14

Those are the questions

Mathematics
1 answer:
Mila [183]3 years ago
8 0

Step-by-step explanation:

We need to know

a^{-1} =\frac{1}{a}

so

(a)

5^x = 125^(-1)

5^x = 5^(-3)

x = -3

(b)

3^(-3) * 10^(-3)

= (3*10)^(-3)

=1/27000


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One day the temperature was 72°F. That night, the temperature was 44°F. What number represents the change in temperature?
DedPeter [7]

Answer:

28°F

Step-by-step explanation:

We can find the change in temperature by subtracting 44 from 72:

72 - 44 = 28

So, the change in temperature was 28°F

8 0
3 years ago
Read 2 more answers
Janet scored 200 and 400 points in the first 2 rounds of a computer game.
7nadin3 [17]

Answer:

B. (200+400)-250=p

Step-by-step explanation:

Let p be number of points Michael needs to score in 2nd game to catch up.

We have been given that Janet scored 200 and 400 points in the first 2 rounds of a computer game. So the total points scored by Janet in two games will be: (200+400) points.

We are also told that Michael had scored 250 points in the first round and he want to get the same total score as Janet.

So we can find the number of points Michael needs to score to catch up Janet by subtracting the number of points scored by Michael in 1st game from total number of points scored by Janet in two games. We can represent this information in an equation as:

(200+400)-250=p

Therefore, the equation (200+400)-250=p will help Michael to find the number of points he need to catch up Janet and option B is the correct choice.


3 0
4 years ago
Read 2 more answers
I’ll give brainlist award please answer
lina2011 [118]
For answering multiple choice, you can do the following:

Observe the diagram, noting that one curve has positive slope, and the other has negative slope.
Looking at the equations,
if x and y are on the same side of the equal sign, (which is the case here), then
- coefficients of x and y have equal signs (both+, or both -) then the equation has negative slope.
- coefficients of x and y have different signs (+-, or -+), then the equation has positive slope.
We see the second system has both equations with positive slope, and the third system has both equations with negative slopes.  They're out!

Next, we check the y-intercept of the first equation (by setting x=0),
first system: 0+2y=-10 => y-intercept=-5, slope=-1/2 Good
fourth system: 0-2y=-10 => y-intercept=+5  No good.

Finally, check the x-intercept of the second equation of the first system (by setting y=0)
first system: 3x-0=12 => x-intercept = 12/3=+4, slope = +3  good

So we conclude the first system is the correct answer.
5 0
3 years ago
Select The Equivalent Expression
vladimir1956 [14]
The answer should be B
6 0
3 years ago
If a triangle has sides with lengths of 2x-7, 5X -3, and 2X -2. What is the perimeter of the triangle?
ad-work [718]
To find the perimeter of the triangle you need to add up all the side lengths
2x - 7 + 5x - 3 + 2x - 2
Now move like terms, the ones with x and ones without, next to each other.
(You can skip this step, but I think it makes it easier to understand.)
2x + 5x + 2x - 7 - 3 - 2
Now just add like terms to get your answer.
9x - 12
7 0
4 years ago
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