Answer:
Granite is a one of the most common igneous rock. Its used in building materials and making statues.
Step-by-step explanation:
When it comes to sampling methods, random sampling is one of the most effective. The principal wants the results of his or her sample to be as fair as possible, so it is best to choose students randomly, and in a neutral environment. The mall is not a neutral environment because not all students have access to the mall, and even those who do are not guaranteed to provide accurate results. The same goes for a basketball game, and student council. Samples taken from these environments are likely to produce more bias. However, collecting a survey from every tenth student entering the school one morning is more likely to produce accurate results that are representative of the school population.
First one
remember
a/b=c/d also can be written as
ad=bc
so
first one can be rewritten as
3x=96
divide both sides by 3
x=32
2nd ones we can just times both sides by 5 to get
x=50/12
3rd one we times 12 both sides to get
x=8
4th one we translate to
4x=63
divide by 4
x=63/4
5th one we translate to
99=5x
divide by 5
99/5=x
6th one we times 21 both sides
6=x
7th one we times both sides by 16
14=x
last one we translate to
45=3x
divide 3
15=x
12.T
13.F
14.F
15.F.
16.???(where is 16?:O)
17.T
18.T
19.T
20.???(where is 20?)
21.5
22.5
Hey there! :D
Supplementary= 180
180= 3x+10+x
x= the first angle I put 3x because it is 3 times the other one, and 10 more.
Now, solve.
180= 4x+10
Subtract 10.
170=4x
Divide both sides by 4.
x=42.5
That is the measure of the first angle.
42.5*3= 127.5
Now, add 10.
137.5 is the second angle.
We can add them to make sure.
137.5+42.5= 180 <== this works
I hope this helps!
~kaikers