Answer:
86
Step-by-step explanation:
Given that there are 30 students in class 10R and the mean marks for the entire class was 70%. Therefore, total mark of class = 70 x 30 = 2100
Given that there are 20 boys in the class and the mean marks for the boys was 62 %. Therefore, total mark of boys = 62 x 20 = 1240
To calculate the mean mark for the girls we need to find the total number of girl and total mark of girls. total number of girl = 30 - 20 (boys) = 10 total mark of girls = total mark of class - total mark of boys = 2100 - 1240 = 860 mean mark for girls = 860 / 10 = 86
Add 6 to both sides so you have -2x = 18. If you divide both sides by -2 you will get x = -9
47 degrees
Work:
90+43+x=180
133+x=180
-133 -133
———————
x= 47
B. The cost of orange juice is $3 per jug
A unit rate, in terms of mathematics, is a rate per unit.
Examples of unit rates are:
The car travels 25 km per hour
The cost of bags of apples is $6.00 per bag of apples.
The unit rate in these choices is Choice B:
The cost of orange juice is $3 per jug
The other choices are rates, not unit rates.
3x - 4y = 7 ; Solve for x
We're essentially just trying to get "x" onto it's own side.
So, in order to do this, we must get "y" onto the other side of our equal sign.
Add 4y to both sides.
3x = 4y + 7
Then, we divide 3 from both sides.
x = 4/3y + 7/3
15y + 1 = x ; Solve for y.
Instead of solving for x, we are now solving for y :)
So, in order to isolate y, we must subtract 1 from both sides.
15y = x - 1
Then, divide both sides by 15.
y = 1/15x - 1/15
~Hope I helped!~
