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storchak [24]
3 years ago
7

Luis can do 78 up downs in 4 minutes. At this rate, how many

Mathematics
2 answers:
Svetllana [295]3 years ago
6 0

Answer:

i have no clue, sorry

Step-by-step explanation:

Doss [256]3 years ago
4 0
The answer would be 8 minutes
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Find the missing exponent.<br> 100 = 1,000<br> Submit
kirza4 [7]
1000 is the missing exponent
3 0
2 years ago
Which of the following is a perfect square trinomial?
yanalaym [24]
Your answer is D. 16x² - 56xy + 49y².

A perfect square trinomial is the result of a squared binomial, like (a + b)². Using this example, the perfect square trinomial would be a² + 2ab + b², as that is what you get when you expand the brackets.

Therefore, to determine which of these is a perfect square trinomial, we have to see if it can be factorised into the form (a + b)².

I did this by first square rooting the 16x² and 49y² to get 4x and 7y as our two terms in the brackets. We automatically know the answer isn't A or B as you cannot have a negative square number.

Now that we know the brackets are (4x + 7y)², we can expand to find out what the middle term is, so:

(4x + 7y)(4x + 7y)
= 16x² + (7y × 4x) + (7y × 4x) + 49y²
= 16x² + 28xy + 28xy + 49y²
= 16x² + 56xy + 49y².

So we know that the middle number is 56xy. Now we assumed that it was (4x + 7y)², but the same 16x² and 49y² can also be formed by (4x - 7y)², and expanding this bracket turns the +56xy into -56xy, forming option D, 16x² - 56xy + 49y².

I hope this helps!
6 0
3 years ago
Read 2 more answers
Choose the correct molecular geometry of the phosphorus atom in each of these ions from the list below: A) square plane B) T-sha
mario62 [17]

Answer:

See attached picture.

Step-by-step explanation:

See attached picture.

For remaining parts resubmit question.  

5 0
3 years ago
Evaluate csc (3pi/14) and cot (5pi/12) using a calculator.
ELEN [110]
The drop down answers are
csc= 1.604
cot= .268
5 0
3 years ago
????????????????????????????
Anna [14]
If you type in both the coordinates it’ll give you the answer on google. That’s how I did this.
3 0
2 years ago
Read 2 more answers
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