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777dan777 [17]
3 years ago
10

Solve the system of linear equations by substitution. 9. 2x+3y=25 and 4x-y=15

Mathematics
1 answer:
lana66690 [7]3 years ago
4 0
2x+3(4x-15)=25
14x-45=25
14x=70
x=5
y=5
(5,5)
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John has $1 in a savings account that earns 5% interest compounded annually
kiruha [24]

Answer:

16 cents

Step-by-step explanation:

A = P (1 + r)n

A = $1 (1 + 0.05)3

A = $1 x 1.16

A = $1.16

To find the compound interest only;

Compound Interest = Final Value - Initial Value

Compound Interest = $1.16 - $1

Compound Interest = $0.16

Hence the compound interest John will earn in his savings account will be 16 cents.

3 0
4 years ago
–0.2(x – 20) = 44 – x
GarryVolchara [31]

-0.2(x-20)=44-x\qquad\text{use distributive property}\\\\-0.2x+4=44-x\qquad\text{subtract 4 from both sides}\\\\-0.2x=40-x\qquad\text{add x to both sides}\\\\0.8x=40\qquad\text{divide both sides by 0.8}\\\\x=\dfrac{40}{0.8}\\\\x=\dfrac{400}{8}\\\\\boxed{x=50}

5 0
3 years ago
Read 2 more answers
I invested $1585 for 5 years and<br> earned $475.50 in interest. What was<br> the interest rate?
rjkz [21]

Answer:

 6%

Step-by-step explanation:

Given data

Principal= $1585

Time = 5 years

Interest =  $475.50

Rate =???

The expression for the interest is given as

SI=PRT/100

substitute

475.50=1585*R*5/100

Cross multiply

475.50*100= 7925R

47550=7925R

R= 47550/7925

R= 6%

Hence the rate is  6%

8 0
3 years ago
Give an example of parallel lines in the real world. Then describe how you could prove that the lines are parallel.
zhuklara [117]
The sides of a TV.

since left and right (sides) goes up and down


---------------
| T.V | <-- SIDES R THE SAME VERTICAL
| °°° | LINE <UP AND DOWN>
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4 0
3 years ago
two numbers are such that if 11 is added to the first number,the answer is twice the second number.Also,if 25 is subtracted from
hichkok12 [17]

Answer: x = 37 and y = 24

Step-by-step explanation:

So I assume the question means x+11=y*2 and x-25=y/2. I couldn't write all the steps on here because I did it on paper but the answer is x = 37 and y = 24

4 0
3 years ago
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