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telo118 [61]
3 years ago
11

A) 4x + 5y = 13

Mathematics
1 answer:
Andre45 [30]3 years ago
4 0

Answer:

C) 20x + 25y = 65

−20x + 16y = 64

Explanation:

These two systems are relatively proportionate to each other because the bottom equation was multiplied by −2, while the top equation was multiplied by 5 in order to get two <em>additive-inverse</em><em> </em>coefficients to eliminate with their variables, which in this case are −20x and 20x. Additive inverses result in zero.

I am joyous to assist you anytime.

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1 = 1/3 + 2/7 + x
where x is the fraction for people ages 25 to 50 years old
x = 8/21

So, the actual number of people ages 25 to 50 years old is:

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7 0
3 years ago
Not prime number in 12n- 5
Alona [7]

Answer:

55

Step-by-step explanation:

12 x 5 = 60

60-5 = 55

55 is not prime

5 0
2 years ago
I have 8 pennies and some quarters, nickels, and dimes. The number of pennies plus nickels equals the number of dimes. I have 3
Darina [25.2K]

There are five nickels.

Let <em>w</em> = the number of pennies; <em>x</em> = the number of nickels; <em>y</em> = the number of dimes; <em>z </em>= the number of quarters.

Then, we have three equations with four unknowns:

(1) <em>w</em> + <em>x = y </em>

(2) 3<em>w</em> = 2<em>z</em>

(3) 2<em>y</em> = 3<em>z</em>

However, there is a fourth <em>unstated </em>condition: <em>w</em>, <em>x</em>, y, and <em>z</em> must all be integers.

Assume that z = 6 (to avoid fractions).

From Equation (2), w = 4.

From Equation (3), y = 9.

Insert the values for <em>w</em> and <em>y</em> into equation (1).

4 + <em>x</em> = 9

x = 9 – 4 = 5

Thus, there are 4 pennies, 5 nickels, 9 dimes, and 6 quarters.

<em>Check</em>: 4 pennies + 5 nickels = 9 dimes

6 quarters + 4 pennies = 3 quarters for every 2 pennies

9 dimes + 6 quarters = 3 dimes for every 2 quarters

5 0
3 years ago
Read 2 more answers
I am a 3-digit number less than 300. My tens digit is less than my ines digit and my ones digit is less than my hundred digit? W
den301095 [7]
201 I think is the answer
6 0
3 years ago
What is the volume of this shape?
jenyasd209 [6]
Answer:
600 ft cubed
Step-by-step explanation:
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1/2(4*12*9) = 216 ft cubed

Formula for rectangular prism V = (l*w*h)
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Adding the values: 600 ft
6 0
2 years ago
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