All categories

2 years ago

Which of these expressions requires a variable?

Mathematics

1 answer:

Tatiana [17]2 years ago

7 0

D. there is no numbers to work with so you just have to use a variable

You might be interested in

A tangent from point P to a circle of radius 4 cm is 10 cm long. Find: a the distance of P from the centre of the circle <br

d1i1m1o1n [39]

Answer:

see explanation

Step-by-step explanation:

The tangent and the radius at the point of contact form a right angle

Using Pythagoras' identity on the right triangle formed.

Let x be the distance from the centre to P, then

x² = 4² + 10² = 16 + 100 = 116 ( take the square root of both sides )

x = $\sqrt{116}$ ≈ 10.77 cm (to 2 dec. places )

let the required angle be Θ, then

Using the sine or cosine ratio in the right triangle.

cosΘ = $\frac{adjacent}{hypotenuse}$ = $\frac{10}{\sqrt{116} }$

Θ = $cos^{-1}$ ( $\frac{10}{\sqrt{116} }$ ) ≈ 21.8°

7 0

3 years ago

1a/3a + 2 = 11 what does a equal

VashaNatasha [74]

Because in the numerator and denominator of the fraction 1a/3a, you're able to simplify that and get 1/3. There is actually no solution to the problem you're asking. You're unable to find out what (a) equals.

4 0

3 years ago

PLEASE THIS IS TIMED I REALLY NEED HELP AND BRAINLIEST!! :(

Mademuasel [1]

Answer:

It is 24^21 without hesitation

6 0

3 years ago

Read 2 more answers

PLEASE HELP!! BE AUICK AND EXPLAIN!Solve the system by graphing!

zubka84 [21]

The answer to the question is (2,-2) d

4 0

3 years ago

Given a quadratic function in vertex form:

Alja [10]

Answer:

See below

Step-by-step explanation:

Part A

A vertical stretch takes place when $a\cdot f(x)$ given that $|a| > 1$

Part B

A vertical compression takes place when $a\cdot f(x)$ given that $0 < |a| < 1$

Part C

A vertical stretch is different than a horizontal compression:

In a vertical stretch, the input stays the same, but the output is multiplied by the scale factor
In a horizontal compression, the output stays the same, but the input is multiplied by the scale factor

Part D

A reflection across the x-axis means that the output, our y-variable, is the opposite sign. This means that all values of $a$ must be negative such that $a\cdot f(x)$ as mentioned in parts A and B. Also, in part C, since our scale factor is negative, the output is the only one being multiplied by the scale factor.

7 0

2 years ago