Answer:
Step-by-step explanation:
What you must do for this problem is to re-imagine the equation in "vertex form"
Vertex form:
where "h" shifts the graph to the right if "h" is positive" and to the left if "h" is negative. K shifts the graph up and down.
a=1
h=1
k=0
So, your final answer should be:
Let speed of the boat in still water = x miles per hour
Let speed of the current = y miles per hour
When water and current both flow in same direction then effective speed will be sum of both speeds that is (x+y)
now plug the given values in formula speed=distance/time
we get equation:
(x+y)=160/8
or x+y=20...(i)
When water and current both flow in opposite direction then effective speed will be difference of both speeds that is (x-y)
now plug the given values in formula speed=distance/time
we get equation:
(x-y)=160/40
or x-y=4
or x=4+y...(ii)
plug value of x into (i)
4+y+y=20
4+2y=20
2y=16
y=8
plug value of y into (ii)
x=4+8=12
Hence final answer is given by:
Speed of the boat in still water = 12 miles per hour
Speed of the current = 8 miles per hour
8) B - It's asking for the price you should offer, so you want to find 7% of the asking price (p) by multiplying it to 0.07 (which is 7%, move decimal to left 2 places). Then you want to subtract that number from the asking price to get the amount you should offer
9) C - It's asking for how much money you'll save, so you need to multiply how much computers you'll buy (25) to the price of each computer (z). Then you'll multiply that number to 0.19 (which is 19%, move decimal to left 2 places) to get how much you'll save
He would need seven because 9x6=54 but there would be three left you he needs 7 hope that helps