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SOVA2 [1]
3 years ago
5

Can someone please help with number 7

Mathematics
1 answer:
zepelin [54]3 years ago
6 0

Answer:

Step-by-step explanation:

h(t) = - 6 cos (πt/30) + 7

determine value of t when h(t) = 3

3 = -6 cos (πt/30) + 7

-4 = -6 cos (πt/30)

cos (πt/30) = 2/3

πt/30 = 0.841069rad or 2π - 0.841069rad [in first cycle]

t = 0.841069*30/π = 8.03s or

t = 30/π (2π - 0.841069) = 30/π (5.44211630718) = 51.97s

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Which is a zero of x2 − 8 = 2x?
Nastasia [14]

Answer:

The zeros are x=4, -2

Step-by-step explanation:

Its zeros can be found by setting the function to zero. The values of x that represent the set equation are the zeroes of the function. To find the zeros of a function, find the values of x where f(x) = 0.

Hope this helped!!!!

5 0
3 years ago
There are 3 questions and they are on each picture, I don't understand these so please help!
Lilit [14]
2A. Answer is 42.7. C squared minus B squared equals A squared. C^2 - B^2 = A^2. 48^2 - 22^2 = 42.66^2.
8 0
4 years ago
Two trains, Train A and Train B, weigh a total of 381 tons. Train A is heavier than Train B.
icang [17]

Answer:

Train A is 287 tons

Train B is 94 tons

Step-by-step explanation:

My method of solving it may have been a bit different from how you were taught. I divided 381 by 2 to give both trains an equal weight of 190.5 tons. I then divided the difference, 193, by 2 to get 96.5 tons. I subtracted the new difference from the weight of Train B and added it to train A. To double check, you can grab a calculator and see that their weights are equal to 381.

4 0
3 years ago
A carpenter built three bookcases, A, B and C, to stand next to each other along a wall. The total length of the wall is 456 cen
horsena [70]

Answer:

The width of bookcase D is 61 cm

The width of bookcase E is 61 cm

Step-by-step explanation:

see the attached figure to better understand the problem

step 1

Sum the widths of the three bookcases A, B and C

132+94+108=334\ cm

step 2

Subtract the sum of the three bookcases A,B and C from the total length of the wall

456-334=122\ cm

step 3

Divide that answer in step 2 by 2, and that will let you know the widths of D and E, because they may have equal widths

122/2=61\ cm

therefore

The width of bookcase D is 61 cm

The width of bookcase E is 61 cm

8 0
3 years ago
4 yd 2 ft = ____ ft (what should go in the space)
zzz [600]
Hello.

The answer is "14 feet".

1 yard=3 feet

4*3=12

12+2=14

=14 feet

If you need anymore help feel free to ask me!

Hope this helps!

~Nonportrit
8 0
3 years ago
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