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noname [10]
3 years ago
6

EASY QUESTION Find area and please show working out

Mathematics
1 answer:
vekshin13 years ago
8 0
Area of a semi-circle = 1/2 x x r square.

area of larger semi circle
= 1/2 x x 10 square
= 50

area of smaller semi circle
= 1/2 x x 5 square
= 12.5

Total area = 50 + 12.5 = 196 cm square ( to 3 sf ) or 62.5
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What is the fifth term of the geometric sequence a1=120, a2=36, a3=10.8, a6=0.2916?
iragen [17]
First we need to find the common ratio by dividing the second term by the first term. 36/120 = 3/10

an = a1 * r^(n-1)
n = term to find = 5
a1 = first term = 120
r = common ratio = 3/10
now we sub and solve
a5 = 120 * 3/10^(5 - 1)
a5 = 120 * 3/10^4
a5 = 120 * .0081
a5 = 0.972 <=== fifth term

or we could have just done this......since we multiply by 3/10 to find the next number...
a3 = 10.8......10.8 * 3/10 = 3.24 <== 4th term
3.24 * 3/10 = 0.972 <== fifth term
5 0
3 years ago
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Question 5 of 15
Alex777 [14]

Answer:

i guess its B 105.000

Step-by-step explanation:

|•-•|

7 0
3 years ago
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Jake forgot to replace the cap on a bottle of deodorant. The deodorant began to evaporate at the rate of 12% per day. If the ori
belka [17]

Answer:

graph of function f of x equals 30 multiplied by 0.88 to the power of x

Step-by-step explanation:

The deodorant is begun to evaporate in other words, it is losing mass so the rate of 12% is a decay rate.  In the exponential decay, the graph of the function goes according to the formula:

y=a(1-r)^x

Where a is the initial amount (a=30), r is the rate of decay (r=0.12) and x the times intervals, in this case, measured in days. Substituting the values in the formula:

y=30(1-0.12)^x\\y=30(0.88)^x

Which corresponds with the "graph of function f of x equals 30 multiplied by 0.88 to the power of x".

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