21.4285 just divide 15 by 70
Answer: x>7
Step-by-step explanation:
Because 2 tons of ore in an hour
It says that the government purchase 4 tons, and 10 tons are sold to the mineral extractor
4+10=14
14÷2=7
14>7
You have to turn the percent into a decimal to do the math.
80 * .40 = 32 (That's the discount.) Now we subtract the orginal price from this.
80 - 32 = 48
Now we need to find the tax value.
48 (our new price) * .0675 = $3.24
Add this back onto the price to get our final price.
3.24 + 48 = $51.24
PART 1.
Going westward:
Distance: 2400 miles
Rate (this is speed): (450-wind_speed) mph
Time: distance / speed = 2400 / (450-wind speed)
Going eastward:
Distance: 2400 miles
Rate (this is speed): (450+wind_speed) mph
Time: distance / speed = 2400 / (450+wind speed)
PART 2
Formula for speed:
speed = distance / time
Now we solve this for time:
time = distance / speed
11h = 2400 / (450+-wind_speed)
+- sign is put because in one case wind increases speed of plane and in other case it decreases speed.
PART 3
To solve for wind_speed we start by rearranging formula so that we have wind_speed on left side:
(450+-wind_speed) = 2400 / 11
(450+-wind_speed) = 218mph
To fly this distance in 11h speed of plane must be 218mph.
The only way to get this solution is if we substract wind speed:
450-wind_speed = 218
wind_speed = 450-218 = 232mph
