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klio [65]
3 years ago
11

Write the numerical expression using exponents.

Mathematics
1 answer:
andrew11 [14]3 years ago
7 0
1. 2^3/3^2

2. (-5)^2/7^3

3. -2^2/(-6)^3

4. -3^2/(-5)^2
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SOS PLS HELP ASAP this is so confusing
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3 0
2 years ago
The perimeter of a triangle is 56. The side lengths are x + 4, 3x + 7, and x + 9. What is the value of x?
Sidana [21]
<h3><u>Answer:</u></h3>
  • x = 7.2
<h3><u>Step-by-step explanation:</u></h3>
  • Perimeter: Side 1 + Side 2 + Side 3
  • => x + 4 + 3x + 7 + x + 9 = 56
  • => 5x + 20 = 56
  • => 5x = 56 - 20
  • => 5x = 36
  • => x = 7.2
<h3><u>Conclusion:</u></h3>

Therefore, the value of x is 7.2.

Hoped this helped.

BrainiacUser1357

5 0
2 years ago
A medical devices company wants to know the number of hours its MRI machines are used per day. A previous study found a standard
4vir4ik [10]

The company has to study 199 machines.

In statistics, the standard deviation is a measure of the amount of variation or dispersion of a set of values. A low standard deviation indicates that the values tend to be close to the mean of the set, while a high standard deviation indicates that the values are spread out over a wider range.

It is given that;

Margin of error E = 0.7

Confidence interval 98% = 1-0.98 = 0.02

Standard deviation = 6 hours

Number of MRI machines needed per day n, = [(z alpha/2 * SD)/E]²

Z alpha/2 = 1.645 at alpha = 0.1

Inputting these values into n we have that

[(1.645*6)/0.7]²

= 14.1²

= 198.81 is approximately equal to 199

The company has to study 199 machines.

To know more about standard deviation visit: brainly.com/question/475676

8 0
1 year ago
87 24/25 as a decimal
adoni [48]
87.96 just divide 24 by 25 and keep the whole number as is
8 0
3 years ago
Read 2 more answers
*HELP ASAP I CAN ONLY DO THIS ONE TIME OR ILL FAIL*
docker41 [41]

Answer:

A

Step-by-step explanation:

V= BxHxL divided by 2

6x9x21= 1,134

divided by 2 equals 567yd

7 0
3 years ago
Read 2 more answers
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