Answer: No
Step-by-step explanation:
I guessed..but it was right
Answer:
2.45 × 
Step-by-step explanation:
using the rules of exponents
• 
= 
• 
= 
evaluating the numerator
(3.8 × 
)² = 3.8² × 
= 14.44 × 
R = 
= 
× 
= 2.45 × ← to 2 dec. places
Answer:
No
Step-by-step explanation:
202 hundredths is equivalent to 0.202.
Starting from left, 0 is in unit place, 2 is in Tenths place, 0 is in Hundredths place and 2 is in thousandths place.
The value of 2 (at left, just after decimal) is 1/10
The value of 2 (at right,) is 1/1000
It means, 202 hundredths is equal to 2 tenths and 2 thousandths. Hence, the given statement is not correct.
Answer:
Plane Speed (x) = 378 mph
Step-by-step explanation:
Equation
d = r * t
Givens
With the wind
- d = 1680 miles
- t = 4 hours
- r = x + y
Against the wind
- d = 1680
- t = 5 hours
- r = x - y
Equation
The distances are the same, so you can solve for x in terms of y and then deal with the actual distance.
(x + y)*4 = (x - y)*5 Remove the brackets on both sides
Solution
- 4x + 4y = 5x - 5y Subtract 4x from both sides
- 4y = -4x + 5x - 5y Combine
- 4y = x - 5y Add 5y to both sides
- 5y + 4y = x
- x = 9y
Solution part 2
Now take one of the distance formulas and solve for x first then y.
- (x - y)*5 = 1680 Substitute 9y for x
- (9y - y)*5 = 1680 Subtract on the left
- 8y * 5 = 1680 Multiply on the left
- 40y = 1680 Divide by 40
- y = 1680/40
- y = 42 That's the speed of the wind.
- (x - y)*5 = 1680 Substitute the wind speed for y
- (x - 42)*5 = 1680 Divide both sides by 5
- (x - 42) = 1680 / 5 Do the division on the right
- (x - 42) = 336 Add 42 to both sides.
- x = 336 + 42
- x = 378 mph Plane's speed
