Denise is planning to put a deck in her back yard. The deck will be a 10-by-7-foot rectangle with a semicircle of diameter 4 feet, as shown below. Find the area of the deck (in square feet).(round your answer to two decimal places)

Step-by-step explanation:

You can think of this as adding the area of the rectangular portion of the deck (length x width) and the semicircular portion (πr^2)/2.

(l×w)+(πr^2)/2

(10×7)+((π2^2)/2

79+2π

B

Step-by-step explanation:

Rc =6.7×10^-11 and Rs=1.9×10^-10

since power of 10 is negative in both hence greater the magnitude of power lesser is its value

hence Rc is less than Rs

ratio of radius of atom of sodium to radius of carbon = (1.9×10^-10)÷(6.7×10^-11)

                                                                                        =2.84

hence B