Answer: The last one 15 +15g
Step-by-step explanation:
The last one , is not equivalent because after simplifying the expression, you will get 15g^2 + 45g and the last one doesn't match to it.
30/x = 54/81 what value does x have to be to make it true
2 answers:
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Answer:
b = 12mm
Step-by-step explanation:
Using pythagoras theorem, you will be able to find the answer.
a² = b² + c²
15² = b² + 9²
b² = 15 ² - 9²
b² = 144
b =
∴ b= 12mm
Answer:
- 52 seconds
- 7093 feet
Step-by-step explanation:
This is the kind of problem that is most easily solved graphically, because the solution point coordinates give both the time and the altitude.
The attached graph shows the planes both arrive at the altitude of 7093 feet after 52 seconds.
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The equations for altitude in feet (y) as a function of time in seconds (x) are ...
y = 3687 +65.5x . . . . . plane A
y = 5000 +40.25x . . . plane B
Subtracting the second equation from the first gives . . .
0 = -1313 +25.25x
x = 1313/25.25 = 52 . . . . . . . add 1313 and divide by the x-coefficient
y = 3687 +65.5(52) = 3687 +3406 = 7093
After 52 seconds both planes have an altitude of 7093 feet.
