What is the opposite of 56?What is the value of –(-4)?
1 answer:
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Answer:
x = 1
Step-by-step explanation:
Given :
6x – y = 1
4x – 3y = –11
To Find : the new equation after the expression equivalent to y from the first equation is substituted into the second equation.
Solution :
6x – y = 1 ---a
4x – 3y = –11 ---b
In equation a
y = 6x-1
Now substitute this value of y in equation b
4x – 3(6x-1)= –11
Thus the new equation : 4x-18x+3 = -11
-14x =-14
x=1
Put value of x in equation a
6*1– y = 1
6-y=1
5=y
Thus the solution is (1,5)
Answer:
The probability that a randomly selected high school senior's score on mathematics part of SAT will be
(a) more than 675 is 0.0401
(b)between 450 and 675 is 0.6514
Step-by-step explanation:
Mean of Sat =
Standard deviation =
We will use z score over here
What is the probability that a randomly selected high school senior's score on mathe- matics part of SAT will be
(a) more than 675?
P(X>675)
Z=1.75
P(X>675)=1-P(X<675)=1-0.9599=0.0401
b)between 450 and 675?
P(450<X<675)
At x = 675
Z=1.75
At x = 450
Z=-0.5
P(450<X<675)=0.9599-0.3085=0.6514
Hence the probability that a randomly selected high school senior's score on mathematics part of SAT will be
(a) more than 675 is 0.0401
(b)between 450 and 675 is 0.6514