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Len [333]
3 years ago
15

Will someone help me with problem 21?

Mathematics
1 answer:
Juliette [100K]3 years ago
6 0
Sin^(1/2) x cos x - sin^(5/2) cos x
= sin^(1/2) x cos x - sin(1/2)x sin^2 x cos x
factoring we get:
cos x sin^(1/2) x ( 1 - sin^2 x)
Now 1 - sin^2 x = cos^2 x so we have

cos x sin^(1/2) x * cos^2 x

= cos^3 x sqrt sin x
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Three runners are training for a marathon. One day, they all run about ten miles, each at their own constant speed. Which of the
kotykmax [81]

Answer:

Runner 1 has the fastest pace

Step-by-step explanation:

The first one we need to find the slope

m = (y2-y1)/(x2-x1) = (40-0)/(4-0) =40/4 = 10 minutes per mile

The second  is 8.5 minutes per mile

The third we need to find the slope

m = (y2-y1)/(x2-x1) = (90-72)/(10-8) =18/2 = 9 minutes per mile

6 0
3 years ago
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PLEASE SOMEONE TO HELP ME WHAT ARE THE CORRECT ANSWERS AND IM GIVING BRAINLY
GrogVix [38]

Answer:

10 times greater

Step-by-step explanation:

When you write these as numbers, you get:

800,000,000 (8 hundred million place)

80,000,000 (8 ten million place)

Then divide the greater number by the less number:

800,000,000/800,000,00

make this easier by eliminating 0's:

80<u>0,000,000</u>/8<u>0,000,000</u>

80/8

10

10 times greater is your answer

Hope this helps!

4 0
3 years ago
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deb has a board that measures 5 feet in length how many 1/4 foot long pieces can deb cut from the board?
Julli [10]
Since you can 4 pieces from 1 foot, you multiply 4 by 5 and you get 20 pieces.
5 0
3 years ago
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You are on the 2nd floor, go down 3 floors, and back up 7 floors. On what floor are you on now? *
MariettaO [177]

Answer:

you're on the 6th floor

Step-by-step explanation:

if you started on the 2nd floor and went down by 3 you subtract 3 from 2 which gives you -1, and then you go up 7 floors so you add -1+7 which gives you 6.

8 0
2 years ago
The height of a trapezoid is 8 inches and its area is 48 in.² one base of a trapezoid is 6 inches longer than any other base wha
Mkey [24]
A = (B+b)·h/2 = 48 and B=b+6

2·48 = (b+6+b)·8
12 = 2b + 6
6 = 2b
b = 3 <span>inches
B = 9 </span><span>inches</span>
3 0
2 years ago
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