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ycow [4]
2 years ago
9

if i sold 91 cupcakes at a food fair , the cuocakes were sold in boxes' of a baker's dozen. which is 13 i sold all the cupcakes

at $15 per box. how much money did i receive
Mathematics
1 answer:
denis-greek [22]2 years ago
4 0
There are 91 cupcakes and you sold boxes containing 13 cupcakes so you sold 7 boxes. 

91 / 13 = 7

7 X 15 = $105
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Find the 30th derivative of y=cos(2x)
Sladkaya [172]

I got this answer from someone else so I’m not sure this is correct but I really hope it helps...

Step-by-step explanation:

Look for patterns in the derivatives.

y=cos2x

y'=-2sin2x

y''=-4cos2x

y'''=8sin2x

y''''=16cos2x

Notice that sin and cos alternate every derivative. Also, they alternate positive and negative every 2 derivatives.

The constant is just 2^(derivative#).

Every odd derivative has sin and every even derivative has cos, so you know that the 30th derivative will be cos.

If you follow the pattern of negatives and positives, you find that the 30th derivative will be negative.

y^(30)= -2^30cos2x

y^(30)= -1073741824cos2x

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3 years ago
Don't know what to do :\\
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Answer: Choice A) 12x^2 - 48x + 21; all real numbers

===========================================================

Work Shown:

(f * g)(x) = f(x) * g(x)
(f * g)(x) = ( f(x) ) * ( g(x) )
(f * g)(x) = ( -2x+7 ) * ( -6x+3 )
(f * g)(x) = -2x*( -6x+3 ) + 7*( -6x+3 )
(f * g)(x) = -2x*(-6x) - 2x*(3) + 7*(-6x) + 7*(3)
(f * g)(x) = 12x^2 - 6x - 42x + 21
(f * g)(x) = 12x^2 - 48x + 21

The domain is the set of all real numbers because we can plug in any number in for x, to get some output for y. There are no issues to worry about such as division by zero errors, square root of a negative number, etc. 
6 0
3 years ago
Janine opens a savings account with a deposit of $720. The account pays 3.4% interest, compounded daily. What is the first day's
scoray [572]
The first days interest is $24.48
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Please help, will mark Brainly and if you need help with anything I’ll help with any work you send
inessss [21]

Answer:

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In the second one (d + 7) is missing so it will be 8d(d + 7) so if you factor that out you will receive 8d^2 + 56

Step-by-step explanation:

3d^2 + 18d -21 =(3d -3)( d + 7)

3d^2 -30d +27 =(3d -3)(d - 9)

6 0
3 years ago
I need help with completing the reasons for the proof. The first 3 statments are given. ​
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Answer:Two-column, paragraph, and flowchart proofs are three of the most common geometric proofs. They each offer different ways of organizing reasons and statements so that each proof can be easily explained.

Step-by-step explanation:

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