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Mandarinka [93]
3 years ago
9

Solve for x. x2 - 49 = 0 A) 0 B) ±49 C) ±49i D) ±7

Mathematics
2 answers:
Nikolay [14]3 years ago
6 0

Answer:

D

Step-by-step explanation:

x^2=49 -> 7

x^2=-49 -> -7

really need brainliest - it would be appreciated

xxTIMURxx [149]3 years ago
3 0
The correct answer is D.
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What is the surface area to a cylinder
Maslowich

Answer:

  A. 2(Pi)rh+2(Pi)r^2

Step-by-step explanation:

The surface area of a cylinder is the sum of the lateral area and the area of the two circular ends.

The lateral area is the product of the circumference of the cylinder and its height:

  lateral area = 2πrh

The area of the two ends is twice the area of each of those circles, so is ...

  total end area = 2(πr²)

Then the total surface area of a cylinder is ...

  SA = 2πrh +2πr²

7 0
4 years ago
In the football game, a penalty of -15 yards was applied to a gain of 43 yards. What was the net gain?
Stella [2.4K]

Answer:

c

Step-by-step explanation:

28

7 0
3 years ago
Find all solutions to the equation in the interval [0, 2π). cos 2x - cos x = 0
Jlenok [28]
This is the concept of algebra, to solve the expression we proceed as follows;
cos 2x-cosx=0
cos 2x=cosx
but:
cos 2x+1=2(cos^2x)
thereore;
from:
cos 2x=cos x
adding 1 on both sides we get:
cos 2x+1=cos x+1
2(cos^2x)=cosx+1
suppose;
cos x=a
thus;
2a^2=a+1
a^2-1/2a-1/2=0
solving the above quadratic we get:
a=-0.5 and a=1
when a=-0.5
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x=120=2/3π
when x=1
cos x=1
x=0
the answer is:
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4 0
3 years ago
Read 2 more answers
Shawnte earned a score of 42 points. There were 19 competitors who received a lower score than Shawnte and 5 competitors who ear
Natasha_Volkova [10]

Answer: 80th percentile

Step-by-step explanation:

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= 19 + 5 + Shawnte

= 25 competitors

Out of these 25 competitors, Shawnte took the 20th position.

Percentile is:

= 20/25 * 100

= 80th percentile

5 0
3 years ago
Estimate square root 250 to two decimal points
Juli2301 [7.4K]
OK, the square root of 250 is 15.811 . . . 
but since this can't be expressed as a decimal for your purposes, let's try factoring. Since 250 ends in a zero, only numbers 5 or 0 or those ending in 5 or 0 could be factors. 
The square root of 250 can be factored into the square root of 25 and the square root of 10. 
The square root of 25 is exactly 5, and the exact square root of 10 is another decimal, so your simplified answer can be expressed as 5 times the square root of 10.
3 0
3 years ago
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