The times for erin’s five laps around the track were 56.6 seconds, 57.9 seconds, 57.5 seconds, 65.3 seconds, and 65.7 seconds. using rounding to the nearest whole second as the only estimation technique, what is the total estimated time for erin’s five laps in seconds?

303 s  

Step-by-step explanation:

Lap             Time/s

1                   56.6 s

2                   57.9 s

3                   57.5 s

4                   65.3 s

5                   65.7 s

   TOTAL  = 303    s

304 seconds

Step-by-step explanation:

The question asks for you to round to the nearest whole second.

To round to the nearest whole second: you look at the tenth space (first number on the right of the decimal). If it is 5 or more, then the number to the left of the decimal goes up one and you drop all numbers after the decimal. If it is less than 5, the numbers to the left of the decimal stay the same. For example: 3.5 would become 4 and 3.3 would become 3.

Step 1: Round the numbers

1st number 56.6 rounds to 57  

2nd number 57.9 rounds to 58

3rd number 57.5 rounds to 58

4th number 65.3 rounds to 65

5th number 65.7 rounds to 66

Step 2: Add the rounded numbers

57 + 58 + 58 + 65 + 66 = 304

Your answer is 304 seconds

i think it is 18

step-by-step explanation:

answer: ratio of volume of cone (with 3 times the height and equal diameter) to volume of cylinder is 2 to 1. the value of π is not used.

step-by-step explanation:

radius is diameter/2 = 4.

area of circle is π r^2.

volume of cylinder is height × area of base = hπr^2 = 3(4^2) π = 48π cubic inches.

not knowing the formula for volume of cone, i calculate it using calculus (which is for calculating things).

volume of cone is integral 0 to h area(y) dy. area(y) is π r(y)^2. r(y) runs r to zero as y runs zero to h, r(0) = r, r(h) = 0.

r(y) = r - r/h y

area(y) = π (r - r/h y)^2 = π (r^2 - 2r^2y/h + r^2y^2/h^2) = π r^2(1-2y/h+y^2/h^2)

antiderivative area(y) = π r^2 (y-y^2/h+y^3/(3h^2))

integral 0 to h = π r^2(h-h^2/h+h^3/(3h^2) - (0)) = π r^2(h - h + h/3) = π r^2(h/3) = π/3 r^2 h

volume of this cone is π/3(4^2)18 cubic inches.

= 6 16 π = 96π cubic inches.

cone has twice the volume, 96/48.

cone height is 6 times the cylinder.

ratio of volume formula: π r^2 cancels.

cone over cylinder ratio is 6h/3 to h, 2 to 1.