Answer:
112.5 mL
Step-by-step explanation:
Let x represent the amount of grape juice to add. Then the total amount of grape juice in the mix is ...
0.15(1800) +x = 0.20(1800+x)
270 +x = 360 + 0.2x . . . . . . eliminate parentheses
0.8x = 90 . . . . . . . . . . . . . . . subtract 270+0.2x
x = 90/0.8 = 112.5 . . . . . . . . divide by the coefficient of x
112 mL of grape juice should be added to make a mix that is 20% grape juice.
See the picture attached to better understand the problem
in the figure C is the <span>fire hydrant
</span>
we know that
in the right triangle ABC
AB=opposite side angle x
BC=adjacent side angle x
tan x°=AB/BC-----> 125/72
x=arc tan (125/72)-----> x=60.06°
the answer is
the angle of elevation from the fire hydrant to the top of the building is 60.06°
Just it is Android robot or Among Us
For a survey like this, you want to take a random sample. It would be a good idea to use an alphabetical list of the students. Then, you could randomly select students from the list.
The principal would want to avoid surveying all the same type of students. For example, don't just ask the athletes.