Amanda exercised for 10 minutes every day in the first week, 20 minutes in the second week, 30 minutes in the third week, and 40 minutes in the fourth week. Billy exercised for 10 minutes every day in the first week, 20 minutes in the second week, 40 minutes in the third week, and 80 minutes in the fourth week. Which statement best describes the methods used by Amanda and Billy to increase the time they spent exercising? Amanda's method is linear because the number of minutes increased by an equal number every week. Billy's method is linear because the number of minutes increased by an equal factor every week. Both Billy's and Amanda's methods are exponential because the number of minutes increased by an equal factor every week. Both Billy's and Amanda's methods are exponential because the number of minutes increased by an equal number every week.

Amanda's method is linear because the number of minutes increased by an equal number every week. Billy's method is linear because the number of minutes increased by an equal factor every week

Step-by-step explanation:

Amount of exercise in minutes for Amanda : 10 , 20 , 30 , 40

Amount of exercise in minutes for Billy : 10 , 20 , 40 , 80

Amanda's amount of exercise increases 10 minutes each week

10 + 10 = 20       20 + 10   = 30       30 + 10 = 40

Billy's amount of exercise increases by factor 2 each week

10 x 2 = 20         20 x 2 = 40           40 x 2 = 80

none of the option is correct.

step-by-step explanation:

it says to find which expression equals 9^3 sqrt 10 = ?

9^3 sqrt 10 = 729 sqrt 10.

checking option a. 5 sqrt 10 + 4 sqrt 10

5 sqrt 10 + 4 sqrt 10

= 9 sqrt 10.

checking option b. 5^3 sqrt 10 + 4^3 sqrt 10

5^3 sqrt 10 + 4^3 sqrt 10

= 125 sqrt 10 + 64 sqrt 10

= 189 sqrt 10.

checking option c. 5 sqrt 10 + 4^3 sqrt 10

5 sqrt 10 + 4^3 sqrt 10

= 5 sqrt 10 + 64 sqrt 10

= 69 sqrt 10.

checking option d. 5^3 sqrt 10 + 4 sqrt 10

5^3 sqrt 10 + 4 sqrt 10

= 125 sqrt 10 + 4 sqrt 10

= 129 sqrt 10.

hence, none of the option is correct.

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step-by-step explanation:

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