All categories

4 years ago

Use an Addition or Subtraction Formula to find the exact value of the expression, as demonstrated in Example 1.

1 answer:

6 0

Write tan 75 as tan (30+45)
And,
Use tan (A+B) = tanA+tanB/1−tanAtanB
where A = 30, B=45
tan of 30 is 1/ root 3
tan of 45 is 1

You might be interested in

Find V if r = 2 and L.A. = 12.

lora16 [44]

24 is the answer because you have to muiltuple it

3 0

3 years ago

HELP BROS!! I don’t understand at all soo pls feel free to help

Bess [88]

It will be3:8 and9:64

3 0

4 years ago

PLEASE ANSWER ASAP WILL GIVE BRAINLIEST Bob bought three chapsticks and two eyeliners for 7 dollars. Brandi bought 4 chapsticks

Snowcat [4.5K]

The cost of one chapstick is $1 and one eyeliner is $2.

Step-by-step explanation:

Let,

Cost of one chapstick = x

Cost of one eyeliner = y

According to given statement;

3x+2y=7 Eqn 1

4x+5y=14 Eqn 2

Multiplying Eqn 1 by 4

$4(3x+2y=7)\\12x+8y=28\ \ \ Eqn\ 3$

Multiplying Eqn 2 by 3

$3(4x+5y=14)\\12x+15y=42\ \ \ Eqn\ 4$

Subtracting Eqn 3 from Eqn 4

$(12x+15y)-(12x+8y)=42-28\\12x+15y-12x-8y=14\\7y=14$

Dividing both sides by 7

$\frac{7y}{7}=\frac{14}{7}\\y=2$

Putting y=2 in Eqn 1

$3x+2(2)=7\\3x+4=7\\3x=7-4\\3x=3$

Dividing both sides by 3

$\frac{3x}{3}=\frac{3}{3}\\x=1$

The cost of one chapstick is $1 and one eyeliner is $2.

Keywords: linear equation, elimination method

Learn more about elimination method at:

#LearnwithBrainly

7 0

3 years ago

Write the quadratic equation whose roots are 3 and 1 and whose leading coefficient is 5

Rufina [12.5K]

Answer:

Step-by-step explanation:

added the answe in the sreen shot below that fully explains it

3 0

3 years ago

The cost of coffee is determined by the type of coffee beans that are mixed together. The cost of a local mix of arabica and rob

KatRina [158]

700a + 1200r = 1,000,000

700(1000) + 1200r = 1,000,000

700,000 + 1200r = 1,000,000

1200r = 300,000

r = $\frac{300,000}{1200} = \frac{3000}{12} = 250$

Answer: 250 pounds of robusta beans

6 0

3 years ago