Ask question

Ask question

All categories

alukav5142 [94]

2 years ago

9

Given sin r = 0.5, what is cos r?

1 answer:

Vera_Pavlovna [14]2 years ago

8 0

Answer:

0.877 but rounded it will be 0.88

You might be interested in

6x + 4y=10 12x + y= -29

Olin [163]

Answer: x=-3 y=7.

Step-by-step explanation:

$\displaystyle\\\left \{ {{6x+4y=10\ \ \ \ \ (1)} \atop {12x+y=-29\ \ \ \ (2)}} \right.\\ We\ multiply\ both\ sides\ of\ equation\ (1)\ by\ -2:\\\left \{ {{(-2)*6x+(-2)*4y=(-2)*10} \atop {12x+y=-29}} \right. \\\\\left \{ {{-12x-8y=-20} \atop {12x+y=-29}} \right. \\$ $We\ summarize\ equations\ (1)\ and\ (2):\\-7y=-49\\-7*y=-7*7\\Divide\ both\ sides\ of\ the\ equation\ by\ -7:\\y=7.\\We\ substitute\ the\ value\ of\ y\ into \ equation\ (1):\\6x+4*7=10\\6x+28=10\\6x+28-28=10-28\\6x=-18\\6*x=6*(-3)\\Divide\ both\ sides\ of\ the\ equation\ by\ 6:\\x=-3.$

3 0

1 year ago

A swimming pool is 21.4 feet long and 12.75 feet wide. what area does the pool occupy ?

Serjik [45]

Answer: 272.85
(It’s 21.4 times 12.75)

5 0

2 years ago

Read 2 more answers

The base of a triangle is nine centimeters longer than the perpendicular height. If the area of the triangle is 180 square centi

Rom4ik [11]

Answer:

<em>The base is 24 cm long.</em>

Step-by-step explanation:

<u>Equations</u>

Let's call

b= base of the triangle

h=height of the triangle

The base is 9 cm longer than the height, thus:

b = h + 9

The area of the triangle is:

$\displaystyle A=\frac{bh}{2}$

$\displaystyle A=\frac{(h+9)h}{2}$

And its value is 180:

$\displaystyle \frac{(h+9)h}{2}=180$

Multiplying by 2:

$(h+9)h=360$

Operating:

$h^2+9h-360=0$

Factoring:

$(h-15)(h+24)=0$

The only valid positive solution is:

h = 15 cm

And b = h + 9 = 24

b = 24 cm

The base is 24 cm long.

7 0

3 years ago

Multiply and simplify the product. –12i × 3i Select the product. 36 -36 36i -36i

bazaltina [42]

Answer:

36

Step-by-step explanation:

–12i × 3i

Multiply the numbers

-12*3 = -36

Multiply the imaginary number

i*i= i^2

We know i^2 = -1

-36 * -1 = 36

4 0

3 years ago

Read 2 more answers

Find the GCF of each pair of Monomials: 36k and 144k

kari74 [83]

Answer:

36k

Step-by-step explanation:

36k = 2² × 3² × k

144k = 2^4 × 3² × k

GCF = 2² × 3² × k

GFC = 36k

6 0

2 years ago