Answer:
The first equation
Step-by-step explanation:
If you plug in each point into the equation, you get the corresponding equation
Using the Vertical Angle Theorem 4x + 7 is equal to 5(x - 4).
Solve for x.
4x + 7 = 5(x - 4)
4x + 7 = 5x - 20 <-- Distribute the 5
4x = 5x - 13 <-- Subtract 7 from each side
-x = -13 <-- Subtract 5x from each side
x = 13 <-- Divide both sides by -1
So, x is equal to 13.
Answer: 9.3 x 10^6
Hint: Since 9,300,000 is a big number you want to move the decimal place to the right. You want to stop between the 9 & 3, so if you count the spaces in between it is 6 spaces. Again, since you know the number is big the exponent is positive!
Answer:
f(x)=x^2+3
f(x+y)=(x+y)^2+3
this is done by replacing x with (x+y)
f(x+y)=x^2+2xy+y^2+3
therefore : f(x+y)= x^2+y^2+2xy+3
22. If you add a number to a series of data, and it doesn't change the mean, that number MUST equal the mean. Try adding the mean number into it, hopefully it doesn't change the mode or median either.
23. Basically I think (can't quite read all the question!) just work out the circumference of a circle with radius 20 feet (urgh imperial), ie 2*pi*r so 40pi.