Answer:
The rate of plane in the air is 720km/hr and on the way is 200km/hr
Explanation:
Let the rate of the plane be x;
Let the rate of the wind be y
If the plana fly in the direction of the wind then the speed will be x+y
If the plane flies in the opposite direction to the wind then the speed will be x-y
Using the expression;
Distance = Speed * Time
For the plane flying against the wind;
6(x-y) = 3120
6x-6y = 3120
x-y = 520 .......... 1
For the plane flying with the wind;
7(x+y) = 6440
x+y = 920 ............. 2
Add both expressions;
x+x = 520+920
2x = 1440
x = 1440/2
x = 720
Substitute x = 720 into equation 1
x - y = 520
720 - y = 520
y = 720 - 520
y = 200
This shows that the rate of plane in the air is 720km/hr and on the way is 200km/hr
6. There are 24 hours in a day and he spends 0.6 (60%) percent of it studying. You do 24x0.6= 14.4 this means that he spent 14.4 hours studying.
8. A dozen is 12 so you do 8.75x12= 105 for a dozen oranges.
9. 15.5x1.6= 24.8km
10. 1 year is divided into 4 quarters, each quarter is three months because 12 months divided by 4 is 3. That means she paid 18,800 in march since it’s the third month of the year, in another three months she would pay 18,800 again. Every 1 month she pays 6,266 because 18,800 divided by 3 is 6,266. Every 12 months (or year) she pays 75,200 because 18,800x4= 75,200.
11. Every month he makes 8,000 and he saves 0.4 (40%) percent of it each month. 8,000x0.4=3,200 this means he saves 3,200 every month. Multiply 3,200 by 6 months and he saves 19,200 in 6 months.
(Didn’t do 7 and 12 sorry but hope this helped you understand better!)
Answer:
You will want to add up the total for all four guests (The one after you added the tip) and then since you want to split it evenly, you can multiply it by 1/4.
Answer:
Its 30%
Step-by-step explanation:
I used guess and check.
(25%)
3100*.25 = 775
(30%)
3100*.3 = 930
Answer: -10x+7.5
Step-by-step explanation:
First multiply -2.5(4x)= -10x and then -2.5x-3= 7.5 it should be -10x+7.5