Answer:
.7
Step-by-step explanation:
700 divided by 10 to the power of three:
10 times 10 times is 1000
700 divided by 1000 is...
.7
The answer would be 4.5 or 4 1/2
Degree is exponent, so 5th degree
difference of 2 perfect squares
a^2-b^2=(a-b)(a+b)
t^2-5^2=(t-5)(t+5)
2nd one
complete square
take 1/2 of linear coefient and square it
-6/2=-3, (-3)^2=9
add that to both sides
x^2-6x+9=-8+9
x^2-6x+9=1
factor
(x-3)^2=1
sqrt
take neg and pos root
x-3=+/-1
add 3
x=3+/-1
x=3+1 or x=3-1
x=4 or 2
3rd option
12 - 2(7x - 3) = 3(1-2x) - 5x
12 - 14x + 6 = 3 - 6x - 5x
-14x + 6x + 5x = 3 - 12 - 6
-3x = -15
x = -15/-3
x = 5
Total number of students = 18 + 7 = 25
Average height of the 25 students = 105 - 5 = 100 cm
Sum of height of all students = 100 x 25 = 2500cm
Answer: 2500cm
