3 years ago

Evaluate the following expression. cos135°

Mathematics

1 answer:

Mrac [35]3 years ago

4 0

Negative 1 / Square Root of 2

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hi i'm really struggling with this and its due later today! If someone could show the work of how to do it and the answer that w

GuDViN [60]

Answer:

$\frac{-5 \pm \sqrt{13} }{6}$

General Formulas and Concepts:

Pre-Algebra

Order of Operations: BPEMDAS

Brackets
Parenthesis
Exponents
Multiplication
Division
Addition
Subtraction

Left to Right

Step-by-step explanation:

Step 1: Define

$\frac{-5 \pm \sqrt{5^2-4(3)(1)} }{2(3)}$

Step 2: Evaluate

Evaluate Exponents: $\frac{-5 \pm \sqrt{25-4(3)(1)} }{2(3)}$
Evaluate Multiplication: $\frac{-5 \pm \sqrt{25-12} }{6}$
Evaluate Subtraction: $\frac{-5 \pm \sqrt{13} }{6}$

8 0

3 years ago

X + 78 = 90 can someone solve this for me please?

kondaur [170]

Let's solve your equation step-by-step.

x+78=90

Step 1: Subtract 78 from both sides.

x+78−78=90−78

x=12

Please put brainliest!

8 0

3 years ago

Need help will mark Brainliest

Kisachek [45]

I believe it is x=55. I could be wrong lol

6 0

3 years ago

Read 2 more answers

Find the square root of -36. A-6 B 6 C Cannot be done

r-ruslan [8.4K]

Answer: C) Cannot be done

Taking the square root of a negative number is not possible unless you involve complex numbers. If your teacher has not introduced that topic yet, then you just simply say "cannot be done" or something along those lines.

6 0

3 years ago

Two trains leave stations 374 miles apart at the same time and travel toward each other. One train travels at 95 miles per hour

sveta [45]

2 hrs and 12 min or 2.2 hrs

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3 years ago