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11111nata11111 [884]
3 years ago
11

When multiplying two numbers that are written in scientific notation what do you do with the exponents of the 10

Mathematics
1 answer:
lisabon 2012 [21]3 years ago
6 0
You multiply the exponents of the 10
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. Three types of shirts sold at a store cost $9.00, $11.00, and $12.50. One day, the store sells a total of 23 shirts and makes
lbvjy [14]

Answer:

X + 3y = 23

9x + 36y = 243

11 shirts sold at $9.0 per shirt, 4 shirts sold at $11 per shirt and 8 shirts sold at $12.5 per shirt

Step-by-step explanation:

-----Since we are told to assume that the number of shirts sold for $9.00 each is x, that of $11.00 is y and also that of $12.50 is z.

9x + 11y + 12.5z = 243

9x + 11y + 12.5(2y) = 243

9x + 36y = 243_______ equation 1

----- The statement also read that One day, the store sells a total of 23 shirts and makes $243 on the sales. TWICE AS MANY SHIRTS WERE SOLD FOR $12.50 THAN WERE SOLD FOR $11.00

Z = 2y

x + y + z = 23

X + y + 2y = 23

X + 3y = 23_____ equation 2

Now multiply the above by 9 to have this equation's "x" sharing the same coefficient with that of equation 1

9x + 27 = 207 will be the new one___equation 3

-----Subtract equation 3 from 1 and we have

9x + 36y = 243____ equation 1

9x + 27y = 207____ equation 3

9y = 36

Y = 4

-----Substitute y = 4 in equation 2

X + 3y = 23

X + 4(3) = 23

X + 12 = 23

X = 23 - 12

X = 11

-----Remember that x + y + z = 23

11 + 4 + z = 23

15 + z = 23

Z = 23 - 15

Z = 8.

So therefore, x =11 shirts, y = 4 shirts and z = 8 shirts

4 0
3 years ago
Evaluate the expression a3 -b/c for a = 3, b = 2 and c = 4. write in simplest form
Scilla [17]
Hello There!

Write out your equation:
(a^3 - b)/c
Substitute the values in:
(3^3 - 2)/4
Simplify:
(27 - 2)/4
25/4
Solve:
It is 6.25.

Therefore, your answer is 6 1/4.

Hope This Helps You!
Good Luck :) 

- Hannah ❤

6 0
3 years ago
One day, Alonso decided to keep a record of the time he spent walking and the distance he walked. Which of the following are tru
Vladimir [108]

Answer:

C and E

Step-by-step explanation:

Just did it.

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3 years ago
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Nataly_w [17]

Answer:

667.25 in³

Step-by-step explanation:

V = πr²h = 3.14 x 5² x 8.5 = 667.25

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