Answer:
4
−
3
Step-by-step explanation:
What does that even mean??
Answer:
Step-by-step explanation:
1)
total area = rectangle area + 2 triangle area
= length * width = 2 (
* base * height )
= 7.5 * 6 + 2 (
* 3 * 4 )
= 57 ft²
2)
separate it into two rectangles:
length * width + length * width
6 * 2 + 9 * 4
48 cm²
3)
parallelogram area = base * height
= 20 * 25
= 500 in²
Answer:
R=(4,5)
Step-by-step explanation:
M={x1+x2/2,y1+y2/2}
(6,7)={8+x2/2,9+y2/2}
Equating the x coordinates and y coordinates
6=8+x2/2
12=8+x2
x2=12-8=4
7=9+y2/2
14=9+y2
y2=14-9=5
Let the x ml of water be mixed with 237 ml of ammonia whose strength is 100%, in order to create a mixture of 75% strength.
The equation required to solve this will be:
237/(237+x)=75/100
solving for x we get:
237/(237+x)=3/4
237×4=3(237+x)
948=711+3x
3x+711=948
3x=948-711
3x=237
x=237/3
x=79 ml
therefore the amount of water to be added will be 79 ml