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bazaltina [42]
2 years ago
13

What expression is equivalent to 2^-3/2^-5?​

Mathematics
1 answer:
mr_godi [17]2 years ago
6 0
2^2 , or 4
since the exponents have the same base, we can subtract the exponent of the numerator by the exponent in the denominator.

So 2^-3 - 2^-5 = 2^(-3-(-5)) = 2^2

The new exponent is 2 because -3-(-5) is equal to 2.

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At a country concert, the ratio of number of boys to the number of girls is 2:7. If there are 250 more girls than boys, how many
Juliette [100K]

Answer:

100 boys at the concert

Step-by-step explanation:

When changing the ratio between the number of boys to the number of girls, it always has to be equivalent to the original ratio 2:7

So, convert the ratio 2:7 to a different ratio, but it still has to be equivalent to the ratio 2:7. By doing that, multiply both sides of the 2:7 ratio by 50:

  2   :   7

×50   ×50

To get:

100:350  ⇒  This ratio means that the ratio between the number of boys to the number of girls is now 100:350, but that’s okay to have because it’s still equivalent to the original 2:7 ratio.

So, using the new ratio 100:350, this means that there are 100 boys at the concert and 350 girls at the concert, and 350 is 250 more than 100 which proves what the question is asking. So there are 100 boys at the concert.

<u>Answer:</u> 100 boys at the concert

<em>I hope you understand and that this helps with your question! </em>:)

7 0
2 years ago
Solve the system of equations. -5x+2y=9. y=7x
il63 [147K]

- 5x + 2y = 9 \\ y = 7x \\  \\  - 5x + 2 \times 7x = 9 \\  - 5x + 14x = 9 \\ 9x = 9 \\ x = 1 \\  \\ y = 7 \times 1 = 7 \\

Answer: (1; 7)

7 0
2 years ago
Chad gets an annual salary of 25,000. He and his family spend 3500 per year on food. What percent of his salary is spent on food
Advocard [28]

Answer:

\frac{x}{100} x 25000 = 3500

x x 250 = 3500

x = 3500/250

x = 350/25

x = 14%

7 0
3 years ago
If a diameter of a circular chapati is 14 cm what is it's area​
sashaice [31]

Answer:

diameter=14

radius =14/2=7

area =πr²

  • 22/7×7²
  • 154cm²

hope it helps

<h3>stay safe healthy and happy.</h3>
3 0
2 years ago
Read 2 more answers
What is the prime factor of 56
Sauron [17]
56=8*7=2^3*7=2*2*2*7 

Hope that helped
6 0
3 years ago
Read 2 more answers
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