Answer:
Option C is correct i.e. 2.
Step-by-step explanation:
Given the function is f(x) = x² +8x -2.
We can compare it with general quadratic expression i.e. ax² +bx +c.
Then a = 1, b = 8, c = -2.
We can find the number of real root by finding discriminant of the equation ax² +bx +c =0 as follows:-
D = b² -4ac
D = 8² -4*1*-2
D = 64 +8
D = 72.
When D is a positive value, then we have two real roots of the equation.
Hence, option C is correct i.e. 2.
Answer:

Step-by-step explanation:
The given interval : x = 0 to x = 10
Length of interval = 10 - 0
= 10

⇒ Number of equal intervals = 5


Answer:
12
Step-by-step explanation:
the opposite of -12 is 12
Answer:
25ft
Step-by-step explanation:
12 inches = 1 ft. Hence,
120 inches = 10 ft.
Likewise,
1 yard = 3 ft
5 yards = 15 ft
Hence, the length of both cars together is,
10 ft + 15 ft = 25 ft