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nika2105 [10]
3 years ago
5

Please help marking the smartest answer

Mathematics
1 answer:
marishachu [46]3 years ago
5 0
A. Vladimir
Stella was incorrect. She did not multiply 24 feet by 12inches to see how many inches in feet she has total. There are 288 inches in 12 feet, plus the 6 inches is 294 inches. Stella divided the conversion factor instead of multiplying, giving her 2 inches, then added the extra 6 inches giving her 8 inches.
Hope this helps!
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A store finds that its sales revenue changes at a rate given by S'(t) = −30t2 + 420t dollars per day where t is the number of da
allochka39001 [22]

Answer:

Step-by-step explanation:

Give the rate of change of sales revenue of a store modeled by the equation S'(t)= -30t^{2} + 420t. The Total sales revenue function S(t) can be gotten by integrating the function given as shown;

\int\limits {S'(t)} \, dt = \int\limits ({-30t^{2}+420t }) \, dt \\S(t) = \frac{-30t^{3} }{3}+\frac{420t^{2} }{2}\\  S(t)= -10t^{3} +210t^{2} \\

a) The total sales for the first week after the campaign ends (t = 0 to t = 7) is expressed as shown;

Given\ S(t) = -10t^{3} + 210t^{2}

S(0) = -10(0)^{3} + 210(0)^{2}\\S(0) = 0\\S(7) = -10(7)^{3} + 210(7)^{2}\\S(7) = -3430+10,290\\S(7) = 6,860

Total sales = S(7) - S(0)

= 6,860 - 0

Total sales for the first week = $6,860

b) The total sales for the secondweek after the campaign ends (t = 7 to t = 14) is expressed as shown;

Total sales for the second week = S(14)-S(7)

Given S(7) = 6,860

To get S(14);

S(14) = -10(14)^{3} + 210(14)^{2}\\S(14) = -27,440+41,160\\S(14) = 13,720

The total sales for the second week after campaign ends = 13,720 - 6,860

= $6,860

8 0
3 years ago
The radius of this ball is 15 inches. Which equation gives the ball's surface area, in square inches?
lilavasa [31]

Best to look up the formula for the surface area of a sphere and then find it:

A = 4πr^2, where r is the radius of the sphere.  Then,

A = 4π(15 in)^2 = 4(3.14)(225 in^2) =  2826 in^2 (answer)

This is represented by the formula given in the lower left.

8 0
3 years ago
Read 2 more answers
Evaluate 0.3 y+\dfrac yz0.3y+ z y ​ 0, point, 3, y, plus, start fraction, y, divided by, z, end fraction when y=10y=10y, equals,
sergij07 [2.7K]

Answer:

  5

Step-by-step explanation:

Put the numbers where the corresponding variables are in the formula and do the arithmetic.

  0.3y+\dfrac{y}{z}=0.3\cdot 10+\dfrac{10}{5}=3+2=5

The expression evaluates to 5.

6 0
3 years ago
Ash invests £200 and gets 3% interest per year.<br> How much will she have after 5 years?
Taya2010 [7]

Answer:

£231.85

Step-by-step explanation:

→ Work out the decimal multiplier

( 3 + 100 ) ÷ 100 = 1.03

→ Multiply the initial investment by the multiplier raised to the power of years

200 × ( 1.03 )⁵ = £231.85

6 0
2 years ago
Please help! i dont get this
igomit [66]

ANSWER: D.180

EXPLANATION:  A straight angle is 180 degrees

A straight angle changes the direction to point the opposite way. Sometimes people say "You did a complete 180 on that!" ... meaning you completely changed your mind, idea or direction.

8 0
3 years ago
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