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Debora [2.8K]
3 years ago
9

A dolphin was swimming 20 feet below the surface of the water. It descended 8 feet to catch a fish. What integer represents its

current depth?
Mathematics
1 answer:
Dmitry_Shevchenko [17]3 years ago
3 0
-28. It’s underwater which is -20 and went -8 more feet down.
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Determine whether 81 − 49n4 is a difference of two squares. If so, factor it. If not, explain why.
Mumz [18]

We have

81-49n^4=9^2-(7n^2)^2

so this is indeed a difference of squares. Factorizing would give

81-49n^4=(9-7n^2)(9+7n^2)

making the answer D.

We can further factor the first term here and write

9-7n^2=3^2-(\sqrt 7\,n)^2=(3-\sqrt7\,n)(3+\sqrt7\,n)

but that's clearly out of the scope of this question.

7 0
3 years ago
A vegetarian restaurant used 46,170 ounces of spinach last month. This month, with a menu
poizon [28]

Answer:

83100

Step-by-step explanation:

46,170 + .8(46170)

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83100

7 0
1 year ago
Tyrone played 18 holes of golf and had the same score on each of the first 14 holes. He then had the same score on each of the n
Bumek [7]
Answer: A. He scored 3 under par on each of the first 14 holes and 2 over par on each of the next four holes.
3 0
3 years ago
Here is a rectangle ABCD.
lana66690 [7]

Answer:

32%

Step-by-step explanation:

Area of rectangle ABCD = 20 * 30 = 600 Sq cm

After increasing the length and width of the rectangle by 20% and 10% respectively.

New length = 30 + 20% of 30 = 30 + 6 = 36 cm

New width = 20 + 10% of 20 = 20 + 2 = 22 cm

Area of new rectangle = 36*22 = 792 Sq cm

Increase in area = 792 - 600 = 192 Sq cm

Percentage increase in area

= (192/600) *100

= 32%

5 0
3 years ago
Read 2 more answers
A car travels from City A to City B at
Debora [2.8K]

Answer:

90? maybe... i'm not positive but i hope it helped

Step-by-step explanation:

3 0
3 years ago
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