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LenKa [72]
3 years ago
9

Helphelphelphelphelphelphelphelphelphelp

Mathematics
1 answer:
Juli2301 [7.4K]3 years ago
5 0

Answer:

8*15 + 3*5

Step-by-step explanation:

The CD's are 15 dollars each

She buys 8

8*15

The tapes are 3 dollars each

She buys 5

3*5

Add them together

8*15 + 3*5

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21) Rearrange the formula c2 = a2 + b2 for b.
Anvisha [2.4K]
C2 + a2 +2 = b
Would be the new formula
8 0
3 years ago
20 points need help now
-BARSIC- [3]

Answer:

n=5, n^2 = 36 now

Step-by-step explanation:

8 0
3 years ago
Read 2 more answers
Set of data with 350,000 numbers is normally
Rudiy27

Step-by-step explanation:

given a normal distribution with the given parameters the probability (= the % of the area of the distribution curve) for a number to be between 203 and 1803 is

0.9987

so, 99.87% of all numbers are expected to be in that range.

for 350,000 numbers that means

350,000×0.9987 = 349,545 numbers are expected to be between 203 and 1803.

7 0
1 year ago
Harrison made a building using 124 blocks Greyson made a building using 78 blocks how many more blocks did Harrison use than Gre
enyata [817]
124 - 78 = 46.....Harrison used 46 more blocks then Greyson
6 0
3 years ago
Read 2 more answers
Review the steps of the proof of the identity
astraxan [27]

Answer:

step 2

and then step 3 : the error neutralized the error of step 2

Step-by-step explanation:

sin(a + b) = sin(a)cos(b) + cos(a)sin(b)

and because

sin(-b) = -sin(b)

cos(-b) = cos(b)

we have

sin(a - b) = sin(a)cos(-b) + cos(a)sin(-b) =

= sin(a)cos(b) - cos(a)sin(b)

3pi/2 = 270° or -90°.

sin(3pi/2) = sin(270) = sin(-90) = -1

that means, it is the full radius straight down from the center of the circle.

cos(3pi/2) = cos(270) = cos(-90) = cos(90) = 0

so, step 1 is correct :

sin(A - 3pi/2) = sin(A)cos(3pi/2) - cos(A)sin(3pi/2) =

= sin(A)×0 - cos(A)×(-1) (correct step 2)

but as we see, the provided step 2 is incorrect.

it should have been the indicated

sin(A)×0 - cos(A)×(-1)

and NOT the provided

sin(A)×0 + cos(A)×(-1)

step 3 based on the erroneous step 2 should then have been

sin(A)×0 - (1)cos(A)

but instead another error with the sign was made that neutralized the error of step 2 and we got after this second mistake by pure chance the overall correct step 3

sin(A)×0 + (1)cos(A)

so, again, the first error was made in step 2.

but technically, there was also a consecutive error made in step 3 to bring everything back to the correct approach.

4 0
2 years ago
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