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JulijaS [17]
3 years ago
15

Help me with 2 questions please thank you.please show all your work!

Mathematics
1 answer:
ivolga24 [154]3 years ago
6 0
For the first one ,

Let no. Of child be x
And adults are y

So, 210x+315y=2205
And other eqn will be, X+y= 9

By solving, x=6 , and thus y will be 3

So, no of children are 6 and no of adults are 3 !!
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There are three exams in your linear algebra class, and you theorize that your score in each exam (out of 100) will be numerical
Romashka [77]

Answer:

a) 40 hours

b) 60 hours

C) 100 hours

Step-by-step explanation:

0.2a + 0.3b+0.5c = 76

Hence: 0.2* (0.2 λ) +0.3*(0.3 λ )+0.5*(0.5 λ ) = 76

0.38 λ =76

λ = 76/0.38 =200

Thus : 40, 60, 100

7 0
4 years ago
I need help with this questions
SSSSS [86.1K]

Answer:

<u>Picture 1</u>

Your choice C is correct

  • (x - (-2))² + (y - 9)² = 5² ⇒
  • (x + 2)² + (y - 9)² = 25

<u>Picture 2</u>

  • (x + 5)² + (y - 6)² = 36
  • (x - (-5))² + (y - 6)² = 6²
  • r = 6, (h, k) = (-5, 6)

Correct choice is C

<u>Picture 3</u>

  • (x + 5)² + (y + 2)² = 81
  • (x - (-5))² + (y - (-2))² = 9²
  • r = 9, (h, k) = (-5, -2)

Correct choice is C

6 0
3 years ago
Complete the equation of this circle:<br> А<br> (x - [ ? ])2+(y - [ ])2= [ ]
Bingel [31]

equation for a circle is ( x - h )^2 + ( y - k )^2 = r^2,

so in first box - h

in second box - k

after equal to box = r²

7 0
3 years ago
1.Which fraction is the ratio expressed in simplest form?
olganol [36]

1.  divide each number by 6 and you get 4:3  answer c

2. 1x+4x=45  (the ratios give you how many of each you have)

5x=45  so x=9  that is the smallest number

3.  percent means out of 100  so 490/100  4.9

4  percent means out of 100  so .5/100  5/1000  = .005

5 0
4 years ago
Multiply using FOIL or Table method (x + 4) (x + 5)
mylen [45]

Answer:

{x}^{2}  + 9x + 20

Step-by-step explanation:

1) Use FOIL method: (a + b) (c + d) = ac + ad + bc + bd.

{x}^{2}  + 5x + 4x + 20

2) Collect like terms.

{x}^{2}  + (5x + 4x) + 20

3) Simplify.

{x}^{2}  + 9x + 20

<em><u>Therefor</u></em><em><u>,</u></em><em><u> </u></em><em><u>the</u></em><em><u> </u></em><em><u>answer</u></em><em><u> </u></em><em><u>is</u></em><em><u> </u></em><u>x</u><u>²</u><u> </u><u>+</u><u> </u><u>9x</u><u> </u><u>+</u><u> </u><u>20</u>.

5 0
3 years ago
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