To find the mean <span>Just add up all the numbers, then divide by how many numbers there are.
7 sets of numbers
the sum of all numbers is 105
105 </span>÷ 7 = 15
so the mean of the years is 15
The answers would be
12. A
13. B
Answer:
8,9
Step-by-step explanation:
(x)^2+(x+1)^2=145
x²+x²+2x+1=145
2x²+2x+1-145=0
x²+x-72=0
x²+9x-8x-72=0
x(x+9)-8(x+9)=0
(x+9)(x-8)=0
x=-9(rejected being negative)
x=8
x+1=8+1=9
Answer:
2(x +1/2)^2 = -1/2
Step-by-step explanation:
The steps generally will be ...
1. subtract the constant
2x^2 +2x = -1
2. factor out the leading coefficient on the left
2(x^2 +x) = -1
3. add the square of half the x-coefficient inside parentheses, and an equal quantity on the other side of the equal sign
2(x^2 +x +1/4) = -1 +2(1/4)
4. simplify and write in the required form
2(x +1/2)^2 = -1/2
(-2,infinite]
negative two and the infinite symbol
