Answer:
20 % decay
Step-by-step explanation:
Exponential equations are in the form
y = a * b^x
a is the initial value
b is the growth or decay
b>1 is growth b-1 rate of growth
b <1 decay 1-b rate of decay
1-.8 = .2
Change to decimal form
20 % decay
Answer: 7 shirts
Explanation: divide 77 by 9.85 you get 7.88888 repeating. You can’t have part of a shirt so she can buy 7 shirts.
Answer:
A
Step-by-step explanation:
Height of the wall is 27 m.
<u>Explanation:</u>
Let the height of the wall = h
Length of the ladder = 9 m
Angle of elevation = 60°
Ladder rests at 9 m below a vertical wall.
So, length of the wall upto which the ladder rests = h - 9
We know,
Cos Ф = base/ hypotenuse
cos 60° = length of the ladder / height of wall upto which the ladder rests
So,
h - 9 = 18
h = 27
Therefore, height of the wall is 27 m
Answer:
Apple = €0.20
Banana = €0.60
Step-by-step explanation:
Let A represent the price of an apple and B represent the price of a banana:
4A + B = €1.40
7A + B = €2.00 multiply first equation by -1 and then find the sum of the two equations:
-1 x (4A + B) = 1.40
-4A - B = -1.40
7A + B - 4A - B = 2.00 - 1.40
3A = 0.60 divide both sides by 3
A = 0.20 now we can use this information to calculate the price of a banana
4*0.20 + B = 1.40
0.80 + B = 1.40 subtract 0.80 from both sides
B = 0.60
