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2 years ago

Match each expression on the left with an equivalent expression on the right.

Mathematics

2 answers:

Mamont248 [21]2 years ago

7 0

Answer:

1)c

2)d

3)b

4)e

5)a

san4es73 [151]2 years ago

3 0

Answer:

Correct answers

Step-by-step explanation:

1) D

2) C

3) B

4) E

5) A

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Find the value of sin(a/2) if cosa= 12/13

daser333 [38]

Answer: sin $\frac{a}{2}$ = ± $\frac{1}{\sqrt{26} }$

Step-by-step explanation:

We very well know that,

cos2A=1−2sin²A

⟹ sinA = ± $\sqrt{(1-} \frac{cos2A}{2} )$

As required, set A = $\frac{a}{2}$ & cos a= $\frac{12}{13}$ ,thus we get

sin $\frac{a}{2}$ =± $\sqrt{\frac{1-cos a}{2} }$

∴ sin $\frac{a}{2}$ =± $\sqrt{\frac{1-\frac{12}{13} }{2} }$ = ± $\frac{1}{\sqrt{26} }$

since ,360° < $\frac{a}{2}$ <450°

,180° < $\frac{a}{2}$ <225°

Now, we are to select the value with the correct sign. It's is obvious from the above constraints that the angle a/2 lies in the III-quadrant where 'sine' has negative value, thus the required value is negative.

hope it helped!

5 0

3 years ago

B. f(x) = -1x - 4; Find f(-3)

Margaret [11]

Answer:

f(-3) = -1

General Formulas and Concepts:

Pre-Algebra

Order of Operations: BPEMDAS

Brackets
Parenthesis
Exponents
Multiplication
Division
Addition
Subtraction

Left to Right

Algebra I

Functions
Function Notation

Step-by-step explanation:

Step 1: Define

Identify

f(x) = -1x - 4

Step 2: Evaluate

Substitute in x [Function f(x)]: f(-3) = -1(-3) - 4
Multiply: f(-3) = 3 - 4
Subtract: f(-3) = -1

4 0

2 years ago

The wheels on a car have a diameter of 28 inches. How many full

Lorico [155]

Answer:

Step-by-step explanation

14 is the radius so multiply by pi to get 87.96

then turn 200 fee into in which is 2400in

and divide 2400 by 87.96

7 0

3 years ago

Plz help me with this Im timed will mark as brainliest

viktelen [127]

Well what i got was 79.3 by finding the average by adding it all together then divided it by how many numbers

4 0

3 years ago

Read 2 more answers

Which equation is graphed below? A. y=2[x-3] B. y=2[x]-3 C. y=[2x-3] D. y2([x]-3)

kvasek [131]

I think it is C it is probably wrong ☹️

8 0

3 years ago

Match each expression on the left with an equivalent expression on the right. ​

Match each expression on the left with an equivalent expression on the right.