All categories

3 years ago

-2c = -18 a. c= -9 b. c= -36 c. c= 9 d. c= 36

Mathematics

2 answers:

Romashka [77]3 years ago

6 0

-2c = - 18

All you need to do is divided both sides by (-2)

Now you can re-write:

-2c/-2 = -18/-2

As you know -2/-2 = 1

and -18/-2=9

so c =9

Answer is C. c = 9

Marianna [84]3 years ago

4 0

All you have to do is solve for c look at the following steps :)

Step 1. Divide both sides by $-2$

$c= \frac{-18}{-2}$

Step 2. Simplify $\frac{18}{-2}$ to $- \frac{18}{2}$

$c= \frac{18}{2}$

Step 3. Simplify $\frac{18}{2}$ to $9$

$c=9$

Done! :) Your answer is C. c=9

You might be interested in

Given: △ABC, m∠A=60°

Anon25 [30]

Answer:

Perimeter = 32.3

Area = 95.24

Step-by-step explanation:

Given:

△ABC, m∠A=60°

m∠C=45°, AB = 9

To find:

Perimeter of △ABC

Area of △ABC

Solution:

Using angle sum property in a triangle:

m∠A + m∠B + m∠C = 180°

m∠B = 180° - 45° - 60° = 75°

As per Sine Rule:

$\dfrac{a}{sinA} = \dfrac{b}{sinB} = \dfrac{c}{sinC}$

Where

$a$ is the side opposite to $\angle A$

$b$ is the side opposite to $\angle B$

$c$ is the side opposite to $\angle C$

$\dfrac{BC}{sin60^\circ} = \dfrac{AC}{sin 75^\circ} = \dfrac{AB}{sin 45^\circ} \\\Rightarrow \dfrac{BC}{\frac{\sqrt3}{2}} = \dfrac{9}{\frac{1}{\sqrt2}} \\\Rightarrow BC = 12.73\times 0.87 \\\Rightarrow BC = 11.08$