Answer:
9 - 5x = 7
Step-by-step explanation:
Nine (9) less (-) then the product (*) of 5*x, equals (=) to 7
9 - 5x = 7
12 x 12 = 144, 144 x 3 and then subtract 5 to get 427
Answer:
b=4
Step-by-step explanation:
-14+2b= -2b+2
Add 2b to each side
-14+2b+2b= -2b+2b+2
-14+4b =2
Add 14 to each side
-14+4b+14= 14+2
4b = 16
Divide each side by 4
4b/4 = 16/4
b =4
Answer:
The value is 
Step-by-step explanation:
From the question we are told that
The population proportion is 
The sample size is n = 343
Generally given that the ample size is large enough , i.e n > 30 then the mean of this sampling distribution is mathematically represent

Generally the standard deviation is mathematically represented as

=>
=> 
Generally the the probability that the sample proportion will differ from the population proportion by less than 4% is mathematically represented as



=> 
From the z table the area under the normal curve to the left corresponding to 1.887 and - 1.887 is

and

So

=> 
Answer:
Answer:
(
2
,
−
1
)
Explanation:
The quickest way is to use elimination
3
x
+
4
y
=
2
+
2
x
−
4
y
=
8
−
−
−
−
−
5
x
=
10
⇒
x
=
2
Now substitute into one of the original eqns.
3
×
2
+
4
y
=
2
6
+
4
y
=
2
4
y
=
−
4
⇒
y
=
−
1
check in other eqn.
2
x
−
4
y
=
8
2
×
2
−
(
4
×
−
1
)
=
4
−
−
4
=
4
+
4
=
8
√
solns
(
2
,
−
1
)
Step-by-step explanation: