Answer:
x = -5, 5
Step-by-step explanation:
x^2 - 25 = 0
Add 25 to each side
x^2 -25+25 = 0+25
x^2 = 25
Take the square root on each side
sqrt(x^2) = ±sqrt(25)
x = ±5
Answer:
Step-by-step explanation:
Since we are in quadrant 2, sine is positive. Since sine is positive and cosine is negative, then tangent is negative.
Now I'm going to find the sine value of this angle given using one of the Pythagorean Identities, namely .
If given , then we have by substitution of .
Let's solve:
for .
Subtract 4/9 on both sides:
Simplify:
Square root both sides:
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Multiplying top and bottom by 3 gives:
I'm going to move the factor of -1 to the top:
For these similar figures we can write, ratios of their corresponding sides
GH/EA = JI/EA, because GH=JI
JI/EA = y/HI
9/20.25 = y/5
y=9*5/20.25≈ 2.2
Answer:The answer is 7.5808×10^2
Step-by-step explanation:
Because when we take the decimal point backwards ,the exponent is in positive. And the standard form is that the decimal point comes after one non zero number.
Two kilometers equals 2000 meters because 2 times 1000 (the conversion factor) = 2000