Answer:
<u>Answer</u><u>:</u><u> </u><u>D</u>

• first factorise out 10:

• then find factors of the quadratic equation in the bracket:
Answer:
Step-by-step explanation:
<u>Step 1: Set y to 15 and solve</u>
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<em>Add 10 to both sides</em>
<em />

<em>Multiply both sides by 5</em>
<em />

Answer: 
2. (D)
3. (B) Hope it helps
Answer:

Step-by-step explanation:
Given
-- of the roadworks

Required
Determine the speed
In this case:


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<em> --- approximated</em>
I hope this helps you
1.k^2+5k-6=0
a=1
b=5
c= -6
disctirminant =b^2-4ac
disctirminant =5^2-4.1. (-6)
disctirminant =49
x1= -(5)+ square root of 49/2.1
x1=-5+7/2
x1=1
x2= -5- square root of 49/2.1
x2= -5-7/2
x2= -6