I’m pretty sure it is the first one
Answer:
The discriminant is -7
Step-by-step explanation:
The discriminant of a quadratic function/equation(ax^2+bx+c = 0) is calculated as:

Here
b is the co-efficient of x
a is the co-efficient of x^2
and c is the constant
Given equation is:

Here
a = -2
b = 5
c = -4
Putting the values in the formula for discriminant

As the discriminant is negative, the equation has no real solution.
Hence,
The discriminant is -7
Answer:
27.4 km
Step-by-step explanation:
vertical line- y
17 km/y= tan 54
y= 17/tan 54= 25.2 km
25.2/x= cos 23
x= 25.2/cos 23= 27.4 km
Step-by-step explanation:
twice the difference of a number and 6
2×(n - 6)
the correct options are
1.
3.
4.
5.
in other words : 2. and 6. are wrong, as there is no addition, and the expression has to be written with brackets to allow the subtraction to be done before the multiplication.