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gtnhenbr [62]
3 years ago
10

Find the exact value of sec (–660)°

Mathematics
1 answer:
Nostrana [21]3 years ago
8 0
Add full rotations of 360° degree until the angle of between 0° and 360°.
Sec (60)
The exact value is sec (60) is 2
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A rock is dropped from a height of 100 feet. Calculate the time between when the rock was dropped and when it landed. If we choo
Fiesta28 [93]

Answer:

A

Step-by-step explanation:

the rock lands when it reaches height 0.

so, for what t is h(t) = 0 ?

16t² - 100 = 0

16t² = 100

now we pull the square root on both sides (we can ignore the negative solutions, as negative seconds don't make any sense in our scenario)

4t = 10

t = 10/4 = 5/2 = 2.5 seconds

so, A is correct.

6 0
2 years ago
The ratio of boys to girls in the 10th grade is 8 to 13. If there are 91 girls in 10th grade, then how many boys are there?
IRINA_888 [86]

Answer: There are 56 boys in the 10th grade

Step-by-step explanation:

Step 1

ratio of boys to girls in the 10th grade is 8 :13

Number of girls= 91

To find the number of boys, we first find the total number of boys and girls in the 10th grade

Step 2

Now the total ratio= 8 +13=21

Number of girls = ratio of girls/ total ratio  x  Total number of students

91=13/ 21  x  Total number of students

Total number of students =21 x 91 / 13  =147

Step 3

Therefore Number of boys =ratio of boys/ total ratio  x  Total number of student

8/21 x 147=56

6 0
3 years ago
Mean of -32, -41, -39, -27, -33, -44
padilas [110]
Add them all, which is -216. Divide by the number of values, which is the mean of -36.
7 0
3 years ago
P = {52, 77, 91, 124,<br> 217)<br> Three members of the set P have a common<br> factor which is
Marrrta [24]

tis always a good idea when factoring to start off with a quick prime factoring.

\begin{array}{llll} 52&=&2\cdot 2\cdot 13\\\\ 77&=&\boxed{7}\cdot 11\\\\ 91&=&\boxed{7}\cdot 13\\\\ 124&=&2\cdot 2\cdot 31\\\\ 217&=&\boxed{7}\cdot 31 \end{array}

4 0
2 years ago
Please help w/ this question <br><br> image attached
vovikov84 [41]

It is A I vsnududuudududu


3 0
3 years ago
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