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4 years ago

What is 2(d+9) expression

Mathematics

2 answers:

shepuryov [24]4 years ago

7 0

The expression is 2d+18

Ber [7]4 years ago

6 0

If asking to simplify 2d + 18

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Let u = (1, 2 -2), v= (2, 1, 3) and w = j + 4k. a) Find cos theta, where theta is the angle in degrees between u and w.

vodka [1.7K]

Answer: The value of cos theta is -0.352.

Step-by-step explanation:

Since we have given that

$\vec{u}=1\hat{i}+2\hat{j}-2\hat{k}\and\\\\\vec{w}=\hat{j}+4\hat{k}$

We need to find the cos theta between u and w.

As we know the formula for angle between two vectors.

$\cos\ \theta=\dfrac{\vec{u}.\vec{w}}{\mid u\mid \mid w\mid}$

So, it becomes,

$\cos \theta=\dfrac{2-8}{\sqrt{1^2+2^2+(-2)^2}\sqrt{1^2+4^2}}\\\\\cos \theta=\dfrac{-6}{\sqrt{17}\sqrt{17}}=\dfrac{-6}{17}=-0.352\\\\\theta=\cos^{-1}(\dfrac{-6}{17})=110.66^\circ$

Hence, the value of cos theta is -0.352.

8 0

3 years ago

A triangle with angle measures of 45 45 and 90 is

kiruha [24]

Answer:

A right triangle

Step-by-step explanation:

The answer is a right triangle because it has a right angle. A right angle is 90 degrees

6 0

3 years ago

Read 2 more answers

What is x? (4/5)^x=64/125

ankoles [38]

Answer:

x = 3

Step-by-step explanation:

(4/5)^x = 64/125 means that 4^x / 5^x = 64/125

x can only be 3 because 4^3 = 64 and 5^3 = 125

Please mark Brainliest :)

7 0

3 years ago

What is the constant in the expression 12q + 9e + 15

Talja [164]

Answer:

Step-by-step explanation:

the constant in this expression is 15

4 0

3 years ago

Read 2 more answers

Perform the indicated operation. 11(-2) 22 9 -9 -22

ASHA 777 [7]

Answer:

-22

Step-by-step explanation:

When you multiply a positive and negative number together, it becomes negative.

Multiplication is repetitive addition.

11(-2) = -11 + -11 = -22

3 0

3 years ago