Answer:
$39
Step-by-step explanation:
To calculate the total cost of his meal, add the subtotal ($30), the tax on subtotal ($30 X 10%) and the tip ($30 X 20%).
Convert all percentages to decimals to multiply.
Finding tax:
10% = 0.1
Tax = $30 X 0.1 = $3
Finding tip:
20% = 0.2
Tip = $30 X 0.2 = $6
Subtotal + Tax + Tip
= $30 + $3 + $6
= $39
The total cost of his meal was $39.
402cm
Step-by-step explanation:
First use the formula C=2piR( C= 2pi * Radius)
C=2piR
C=2pi(4)
C=8pi
Then multiply 8pi by the number rotations, 8pi x 16 which is 128pi.
The multiply by pi and round it.
128pi=128 x 3.14= 401.9=
402cm
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The given sequence is 4,12,36,108....
Here we can observe the first term = 4 , and so on.
The common ratio (r)=
Since the common ratio is greater than 1,
Therefore the sum of the geometric series =
Since we have to find the sum of first seven terms, so n=7
=
=4372.
Therefore, option C is the correct answer.
Given:
x = 12 in, y = 16 in and z = 20 in
To find:
The surface area of the geometric shape.
Solution:
Area of top rectangle = z × z
= 20 × 20
Area of top rectangle = 400 in²
Area of middle rectangle = z × y
= 20 × 16
Area of middle rectangle = 320 in²
Area of bottom rectangle = z × x
= 20 × 12
Area of bottom rectangle = 240 in²
Area of left triangle =
Area of left triangle = 96 in²
Area of right triangle =
Area of right triangle = 96 in²
Surface area = 400 + 320 + 240 + 96 + 96
= 1152
The surface area of the geometric shape is 1152 in².