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weeeeeb [17]
3 years ago
9

Sara had 324 dollars to spend on 9 books. After buying them she had 18 dollars. How much did each book cost? What is the equatio

n?
Mathematics
2 answers:
sammy [17]3 years ago
5 0

Answer:

Each book costed $34.

Step-by-step explanation:

Let the cost of a book be x.

324-9x=18

Add 9x to both sides:

324=18+9x

Subtract 18 from both sides:

306=9x

9x=306

Divide both sides by 9:

x=34

Each book costed $34.

Alinara [238K]3 years ago
5 0
34 because of inverse operations u subtract 18 from 324 and get 308 and divide that by 9 so it equals 34
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Answer:

The answer is "12 inches".

Step-by-step explanation:

Please find the image file of the graph.

We know AE = CF \ and \ EB = FB so because the triangle is isosceles.

EB = 2x, FB = 2x,\ and \ CF = x when AE is called by x.

We know that AE = AD = x since E and D are tangent points to a circle.

They have CD = CF = x since D and F are tangent points only to circle.

Thus, if the perimeter is 32, the following is the result:

\to AE + EB + BF + FC + CD + DA = 32\\\\\to x + 2x + 2x + x + x + x = 32\\\\\to 8x = 32\\\\\to x = 4

Therefore the length of BC = BF + FC = 2x + x = 3x = 12\  inches

8 0
3 years ago
The construction cost for this road ha been estimated at $135 per linear foot. (1 mile = 5280 ft).
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T. Pitagora twice => new street = 2\sqrt{20} = 8.94 miles;
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8 0
4 years ago
Anna wants to buy a car in two years and wants to have $10,000 for the purchase. How much will Anna need to deposit today in an
Brut [27]

Answer:

Anna will need to deposit \$9,050.25

Step-by-step explanation:

we know that    

The compound interest formula is equal to  

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where  

A is the Final Investment Value  

P is the Principal amount of money to be invested  

r is the rate of interest  in decimal

t is Number of Time Periods  

n is the number of times interest is compounded per year

in this problem we have  

t=2\ years\\A=\$10,000\\ r=0.05\\n=12  

substitute in the formula above  and solve for P

10,000=P(1+\frac{0.05}{12})^{12*2}  

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P=10,000/(1.0042)^{24}    

P=\$9,050.25    

8 0
3 years ago
Rectangle A has a length of 12 and width of 8. Rectangle B has a length of 15 and a width of 10.
navik [9.2K]

Answer:

rectangles are similar figures, thus if scaled copies of each other then the ratios of corresponding sides must be equal

compare ratios of lengths and widths

rectangles A and B

k =  =  ← ratio of lengths

k =  =  ← ratio of widths

scale factors are equivalent, hence rectangle A is a scaled copy of B

rectangles C and B

k =  =  ← ratio of lengths

k =  =  ← ratio of width

scale factors (k ) are not equal, hence C is not a scaled copy of B

rectangles A and C

k =  =  ← ratio of lengths

k =  ← ratio of widths

the scale factors are not equal hence A is not a scaled copy of C

Step-by-step explanation:

6 0
3 years ago
Name a unit of measurement that is about the same size of the weight or mass of 20 staples.
saul85 [17]

Answer:

D

Step-by-step explanation:

7 0
3 years ago
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