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3 years ago

Find two numbers, if their sum is 3 and their difference is 21

Mathematics

1 answer:

boyakko [2]3 years ago

4 0

Answer:

The two numbers are -9 and 12

Step-by-step explanation:

-9+12=3 12--9=12+9=21

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A car with an initial cost of $33,000 is decreasing in value at a rate of 7% each year. Write the exponential decay function to

Brut [27]

Answer:

n= 11.65 years

Step-by-step explanation:

Giving the following information:

Present Value (PV)= $33,000

Future Value (FV)= $15,000

Decrease rate (d)= 7%

To calculate the number of years it will take to reach $15,000; we need to use the following formula:

n= ln(FV/PV) / ln(1+d)

n= ln(15,000/33,000) / ln(1.07)

n= 11.65 years

7 0

2 years ago

Which term best describes the graph of y = 6 x − 1 ? ILL MARK BRAINLEST SO PLS HELP D:

arlik [135]

Answer:

I would say increasing

Step-by-step explanation:

prove me wrong

8 0

2 years ago

If 40% of a given number is 8, then what is 15% of the given number?

Norma-Jean [14]

40% of a given number is 8...
0.40x = 8
x = 8 / 0.40
x = 20....so 20 is the given number

what is 15% of 20...
0.15(20) = 3 <==== ur answer

5 0

3 years ago

Follow the directions to solve the system of equations by elimination. 8x + 7y=39 4x – 14y = -68

harina [27]

Step-by-step explanation:

Hey there!

Here;

The equations are;

$8x + 7y = 39.......(i)$

$4x - 14y = - 68..........(ii)$

Multiplying equation (i) by 2.

16x + 14y = 78

4x - 14y = -68

20x = 10

$x = \frac{10}{20}$

x = 1/2.

Putting value of 'x' in equation (i).

$8 \times \frac{1}{2} + 7y = 39$

$4 + 7y = 39$

$7y = 3 9 - 4$

$y = \frac{35}{7}$

Therefore the value of y is 5.

Check:

Put value of x and y in equation (i).

8x + 7y = 39

$8 \times \frac{1}{2} + 7 \times 5 = 39$

$4 + 35 = 39$

$39 = 39$

(True).

Therefore, the solution is ; (1/2,5).

Hope it helps...

8 0

3 years ago

-5 = 7 + -4/5x I just need answer

Goryan [66]

Answer: x=15

Answer: x=15
.......

8 0

3 years ago

Read 2 more answers