Answer:
It becomes 30
Step-by-step explanation:
When you double a number, it’s increases to two of itself .
So double of 15 means 15 x 2
= 30
Answer:
-y= -4x -4
y= 4x +4
slope is 4
Step-by-step explanation:
Answer:
40%
Step-by-step explanation:
15-9=6
6/15=2/5=40/100=40%
<u>Answer:</u>
$14
<u>Step-by-step explanation:</u>
Assuming the cost of folder to be 
, then the cost of notebook will be 
and the cost of set of pencils will be 
.
Cost of the folder = $2
Cost of notebook = 4 × 2 = $8
Cost of pencil = 2 × 2 = $4
Total cost of 1 folder, 1 notebook and 1 set of pencils = $2 + $8 + $4 = $14
If x^2+bx+16 has at least one real root, then the equation x^2+bx+16=0 has at least one solution. The discriminant of a quadratic equation is b^2-4ac and it determines the nature of the roots. If the discriminant is zero, there is exactly one distinct real root. If the discriminant is positive, there are exactly two roots. The discriminant of <span>x^2+bx+16=0 is b^2-4(1)(16). The inequality here gives the values of b where the discriminant will be positive or zero:
b^2-4(1)(16) ≥ 0
</span><span>b^2-64 ≥ 0
(b+8)(b-8) </span><span>≥ 0
The answer is that all possible values of b are in the interval (-inf, -8]∪[8,inf) because those are the intervals where </span>(b+8)(b-8) is positive.
