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Mathematics

1 answer:

zhannawk [14.2K]3 years ago

4 0

The answer is 9. Thank you for your time

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A gym is in the process of purchasing new 5-pound and 8-pound dumbbells for their aerobics room. Each 5-pound dumbbell costs $8

Lyrx [107]

Let f=number of five pound and e=number of eight pound dumbbells

5f+8e=282

8e=282-5f

e=(282-5f)/8

...

8f+12e=432, using e found above

8f+12(282-5f)/8=432

64f+12(282-5f)=3456

64f-60f+3384=3456

4f+3384=3456

4f=72

f=18, since e=(282-5f)/8

e=24

So there are 18 five pound and 24 eight pound dumbbells in the shipment.

3 0

3 years ago

Read 2 more answers

The length of a rectangle is 12 in. and the perimeter is 56 in. Find the width of the rectangle.

yuradex [85]

Answer:

W = 16 in

Step-by-step explanation:

P = 2L + 2W

56 = 2(12) + 2W

56 = 24 + 2W

56-24 = 2W

32 = 2W

W = 32/2

W = 16 in

Best regards

7 0

3 years ago

rue or false: It is common to denote random variables by upper-case letters and particular values of the random variables by the

jolli1 [7]

Answer:

true

Step-by-step explanation:

5 0

2 years ago

Is each line parallel, perpendicular, or neither parallel nor perpendicular to the line −3x+5y=−15? Drag and drop each choice in

nexus9112 [7]

The first line is perpendicular, the second line is not perpendicular and not parallel , the third line is parallel to the above line and the forth line not parallel or perpendicular to the line.

<h3>How can the slope of the line be calculate?</h3>

The slope of the line is been given as −3x+5y=−15

Then $y= \frac{3}{5x} -3$ , hence the slope is $\frac{3}{5}$