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3 years ago

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:

Picture 1

Your choice C is correct

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

Picture 2

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

Correct choice is C

Picture 3

(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: А (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.

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

Therefor, the answer is x² + 9x + 20.

5 0

3 years ago