Answer:
Option D In step 4 Keith should have subtracted 5 from each side
Step-by-step explanation:
step 1
we have
f(x)=7x+5 -----> given
step 1 is correct
step 2
Change f(x) to y
y=7x+5
so
step 2 is correct
step 3
Exchange x for y and y for x
x=7y+5
so
step 3 is correct
step 4
Subtract 5 each side
x-5=7y+5-5
x-5=7y
<u><em>step 4 is not correct</em></u>
step 5
Divide by 7 each side
(x-5)/7=y
step 6
Change y to g(x)
(x-5)/7=g(x)
step 7
switch sides of the equation
g(x)=(x-5)/7
therefore
In step 4 Keith should have subtracted 5 from each side
Answer:
x=17
Step-by-step explanation:
we know that AD is 90 so you have to subtract 73 to 90
90-73=17 x is a reflection of FD so the value of x is x=17
Answer:
Step-by-step explanation:
Number of marbles with Betty = x
Number of marbles with Adelene = 3x
Adelene gives 25 marbles to Betty.
Now Adelene has (3x - 25) marbles and Betty has (x + 25) marbles.
3x - 25 = x + 25
Add 25 to both sides
3x - 25 +25 = x + 25 + 25
3x = x +50
Subtract x from both sides.
3x - x = x + 50 - x
2x = 50
Divide both sides by 2
2x/2 = 50/2
x = 25
Number of marbles with Betty = 25
Number of marbles with Adelene = 3*25 = 75
Marbles with both = 25 + 75 = 100
Answer: +/- 0.018
All you have to do is plug the known values into the equation and evaluate it.
First, do the work under the square root sign. 0.77(1-0.77) / 2100 gives you a very small number. If you take the square root of that, you will have 0.0091.
The last step is to just multiply that by 2 and you will have 0.018