All categories

3 years ago

Solve for x in the equation: x^2 - x = 20

Mathematics

1 answer:

max2010maxim [7]3 years ago

8 0

X=5
cuz 5^2=25
25-5=20

You might be interested in

An amphitheater has 15 seats in the first row, 19 in the second, 23 in the third, and so on, for 29 rows. How many seats are

Ne4ueva [31]

s(33) = 33*50 = 1650 (amphetheater capacity)

5 0

4 years ago

Read 2 more answers

What is the coordinate point of this equation?

WITCHER [35]

Answer:

y = -2x -2

x + 2y = 2

2x + y = -2 } x1

x + 2y = 2 } x2

2x + y = -2 } we eliminate 2x

2x + 4y = 4 } same signs subtract and different add respectively

-3y = -6

-3 -3

y = 2 (x , 2) we reserve

2x + (2) = -2 we take on the first equation and replace 2 on a coordinate for y

2x = -2 - 2

2x = -4

2 2

x = -2 (-2,2)

x y

4 0

3 years ago

Read 2 more answers

How long will it take for an investment to triple, if interest is compounded continuously at 8%?

maw [93]

Answer:

It will take 14 years before the investment triples

Step-by-step explanation:

Continuous Compounding

Is the mathematical limit that compound interest can reach if it was calculated and reinvested into an account's balance over a theoretically infinite number of periods.

The formula for continuous compounding is derived from the formula for the future value of a compound interest investment:

$FV = PV\cdot e^{i.t}$

Where:

FV = Future value of the investment

PV = Present value of the investment

i = Interest rate

t = Time

It's required to find the time for an investment to triple, that is, FV = 3 PV, knowing the interest rate is i=8%=0.08.

Substituting the known values:

$3PV = PV\cdot e^{i.t}$

Dividing by PV:

$3 = e^{i.t}$

Taking logarithms:

$\ln 3=i.t$

Solving for t:

$\displaystyle t=\frac{\ln 3}{i}$

$\displaystyle t=\frac{\ln 3}{0.08}$

t = 13.7 years

Rounding up:

It will take 14 years before the investment triples

6 0

3 years ago

Solve for x in the diagram below.

Greeley [361]

Answer:

x = 20

Step-by-step explanation:

x + 2x + (x + 10) = 90° (right angle)

x + 2x + x + 10 = 90

Add like terms

4x + 10 = 90

4x = 90 - 10 (substraction property of equality)

4x = 80

x = 80/4 (division property of equality)

x = 20

8 0

3 years ago

Solve by substitution x - 2y = 10 1/2x - 2y = 4

mars1129 [50]

Answer:

ypu can do this by using this please vote

5 0

3 years ago