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coldgirl [10]
2 years ago
14

Which set of numbers has 21 as a common factor?

Mathematics
1 answer:
Soloha48 [4]2 years ago
7 0

Answer:

the answer is A {126,168,189}

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By what percent will the product of two numbers decrease if one of them is decreased by 20% and the other is decreased by 50%?
Furkat [3]

Answer:

(x - .20)(x - .50)

x^{2} = (.20)(.50)

x^{2} = 0.1

x = \sqrt{ .1

x = .32

the product of two numbers decrease by 32%

8 0
3 years ago
A laptop costs $550. You get a coupon in the mail for 30% off. If you use the coupon, what is the sale price for the laptop?
34kurt
The answer appears to be three hundred eighty five can't wait to get those points! Hope your happy with your answer!
8 0
3 years ago
19. Find the pressure exerted by a force of 240 newtons on an area of 30cm? Please help I will mark as brilliant
Dafna1 [17]

Answer: 80000

Step-by-step explanation:

p=<u>f </u>

    a

<u>24</u>

0.003

NOTE:30  ÷10000=<u>0.030km</u>

7 0
3 years ago
. 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
(x+6)(x-2)(x-1)=60 write a polynomial
enot [183]
For this case what you should do is:
 1) Multiplication of terms within parentheses correctly.
 2) Rewrite the expression respecting power properties.
 3) Add or subtract terms of equal power.
 Note: See attached image.
 Answer: 
 x ^ 3 + 3x ^ 2 -16x - 48 = 0

8 0
3 years ago
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