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jenyasd209 [6]
2 years ago
4

Albert buys a car for $12,000. The value of the car depreciates about 9% per year. After about how many years will the car be wo

rth $7500?
Mathematics
1 answer:
Dmitrij [34]2 years ago
5 0

Answer:

5\ years  

Step-by-step explanation:

we know that

The  formula to calculate the depreciated value  is equal to  

D=P(1-r)^{t}  

where  

D is the depreciated value  

P is the original value  

r is the rate of depreciation  in decimal  

t  is Number of Time Periods  

in this problem we have  

P=\$12,000\\r=9\%=0.09\\D=\$7,500

substitute in the formula above and solve for t

\$7,500=\$12,000(1-0.09)^{t}  

(7,500/12,000)=(0.91)^{t}  

Apply log both sides

log(7,500/12,000)=t*log(0.91)  

t=log(7,500/12,000)/log(0.91)=5\ years  

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An isosceles triangle has two equal sides. If two of the sides are 5 inches and 2 inches how long is the perimeter?
Jlenok [28]
Perimeter is the sum of the lengths of all sides on any given shape. In this case, we know that since the triangle is isosceles, two sides must be the same (in a triangle, two of the same angles will produce two of the same sides opposite of the angles). However, there can not be two 2 inch long sides. Think of this logically; If you had two sides of 2 inches connected to a 5 inch long side, no matter what angle you pull those 2 inch sides down, the maximum it could reach is close to their cumulative sum, or around 4 inches. Since 4 inches isn't long enough to reach above 5 inches, then the only possibility for the side lengths is 5 inches + 5 inches + 2 inches. Thus, the perimeter is 12 inches.
4 0
2 years ago
A kite has a height of 36 inches and a width of 30 inches. Explain how to use the area formula for a triangle to find the area o
natta225 [31]

Answer:

You can view a kite as 4 triangles

Step-by-step explanation:

A geometric kite can easily be viewed as 4 triangles.  The formula to calculate the area of a kite (width x height)/2 is very similar to the one of a triangle (base x height)/2.

According to the formula to calculate the area of a kite, we would get:

(36 x 30)/2 = 540.

If we take the approach of using 4 triangles, we could imagine a shape formed by 4 triangles measuring 18 inches wide with a height of 15.

The area of each triangle would then be: (18 x 15)/2 = 135

If we multiply this 135 by 4... we get 540.

7 0
2 years ago
Read 2 more answers
Moises is determining the solution to the system of equations that is show below. Equation representing line A: mc018-1.jpg Poin
dimulka [17.4K]
Answer:
equation of line is:
y = -2x - 6

Explanation:
The general form of the line is:
y = mx + c
where:
m is the slope of the line
c is the y-intercept

(a) getting the slope of the line:
slope of the line is calculated using the following rule:
slope of line (m) = (y2-y1) / (x2-x1) = (-24--12) / (9-3) = -2
The equation now becomes:
y = -2x + c

(b) getting the y-intercept:
The two given points belong to the line. Therefore, to get the y-intercept, we will use one of the points and substitute in the equation and solve for c.
I will use the point (3,-12)
y = mx + c
-12 = -2(3) + c
-12 = -6 + c
c = -12 + 6
c = -6

Based on the above, the equation of the line is:
y = -2x - 6

Hope this helps :)
6 0
2 years ago
One of the fastest times ever recorded for the 50 yard dash is 5.2 seconds. The following expression
igomit [66]

Answer:

Option (1)

Step-by-step explanation:

Fastest time recorded = 50 yards dash is 5.2 seconds.

To convert this time into the rate of miles per hour, expression to be used will be,

\frac{50\text{yd}}{5.2\text{sec}}\times \frac{3\text{ft}}{1\text{yd}}\times \frac{1\text{ mile}}{5280\text{ft}}\times \frac{60\text{sec}}{1\text{min}}\times \frac{60\text{min}}{1\text{hr}}

By cancelling common term in the numerator and denominator in the given expression we will get the answer in miles per hour.

Therefore, Option (1) will be the correct option.

6 0
2 years ago
Which expression(s) have a greatest common factor (GCF) of 3xy2 with 42xy4
Aleks [24]

Answer:

3xy2

Step-by-step explanation:

GCF is the largest  factors which are common in two or more numbers.

We find the GCF of two or more number number by breaking each number into their factor and then observe which factors are common in the group and then we multiple the common number to get the GCF.

Lets understand this by an example

GCF of 24 and 36

factors of 12 = 2*2*2*3  ,   factors of 36 = 2*2*3*3

hence we see that 2,2 and 3 are common in 12 and 36 hence

GCF will be 2*2*3 = 12

Coming back to problem

given

Expression 1 is 3xy^2

factor of 3xy^2 = 3*x*y*y

Expression 2 is 42xy4

factor of 42xy4 = 2*3*7*x*y*y*y*y

common factor between the two expressions are

3, x, y , y

hence GCF will be = 3*x*y*y =3xy2  Answer

3 0
2 years ago
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