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Margarita [4]
3 years ago
12

Composite Figures Question 9. A. 57 ft B. 288 ft C. 208 ft D. 264 ft

Mathematics
1 answer:
Elden [556K]3 years ago
8 0

Answer:

D

Step-by-step explanation:

find area of first rectangle

18 x 6 = 108

find area of second rectangle

20 x 5 = 100

find area of two triangles

7 x 8 =56

56/2 = 28

each triangle has an area of 28

28+28+100+108 = 264ft

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The hardcover version of a book weighs 7 ounces while its paperback version weighs 5 ounces. Forty-five copies of the book weigh
konstantin123 [22]

Answer:

33 copies were paperback and 12 were hardcover.

Step-by-step explanation:

Let h represent the number of hardcover copies and p represent the number of paperback copies.

We know that the total number of copies was 45; this gives us the equation

h+p = 45

We know that each hardcover copy is 7 ounces; this gives us the expression 7h.

We also know that each paperback copy is 5 ounces; this gives us the expression 5p.

We know that the total weight was 249 ounces; this gives us the equation

7h+5p = 249

Together we have the system

\left \{ {{h+p=45} \atop {7h+5p=249}} \right.

We will use elimination to solve this.  First we will make the coefficients of the variable p the same; to do this, we will multiply the top equation by 5:

\left \{ {{5(h+p=45)} \atop {7h+5p=249}} \right. \\\\\left \{ {{5h+5p=225} \atop {7h+5p=249}} \right.

To eliminate p, we will subtract the equations:

\left \{ {{5h+5p=225} \atop {-(7h+5p=249)}} \right. \\\\-2h=-24

Divide both sides by -2:

-2h/-2 = -24/-2

h = 12

There were 12 hardcover copies sold.

Substitute this into our first equation:

12+p=45

Subtract 12 from each side:

12+p-12 = 45-12

p = 33

There were 33 paperback copies sold.

3 0
3 years ago
Read 2 more answers
The area of a triangle whose sides are 3cm, 4cm and 5cm respectively.
irakobra [83]
<h2>3x4x5=60cms </h2><h2>60cm is the correct answer to the question </h2>
7 0
2 years ago
The product of 4 and one less than x is 230. Find x
weqwewe [10]

Answer:

58.5

Step-by-step explanation:

230/4=57.5

57.5+1=58.5

4 0
3 years ago
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Whats complex number ​
Alex

Answer:

Complex numbers are numbers that consist of two parts — a real number and an imaginary number.

3 0
3 years ago
Somebody please solve this ASAP! Nobody answer saying I don't know or how was your day and what not- If you know the answer plea
jeka94

Answer:

40%

Step-by-step explanation:

Her monthly paycheck was 120 dollars, because thats how much she earned that month. If she saved 48 dollars, then the percentage of the paycheck she saved is the percent of 120 that is 48 dollars, or 48/120. Simplifying, we have 2/5, (because you can divide both the top and the bottom by 24), and 2/5 is equal to 40%

4 0
2 years ago
Read 2 more answers
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