14.01.2020

# Which expressions can be used to find m∠bac? select three options. cos−1(startfraction 6.9 over 12 endfraction) cos−1(startfraction 9.8 over 12 endfraction) sin−1(startfraction 6.9 over 12 endfraction) sin−1(startfraction 9.8 over 12 endfraction) tan−1(startfraction 6.9 over 9.8 endfraction)

28

17.02.2022, solved by verified expert

The correct answers are A, D and E

Step-by-step explanation:

## Video explanation

The previous answer said F but it's actually E :)

You're welcome

A, D, F

Step-by-step explanation: Angle BAC is angle A in triangle ABC. Use the definitions of the trigonometric functions:

\cos \angle A=\dfrac{\text{adjacent leg}}{\text{hypotenuse}}=\dfrac{AC}{AB}=\dfrac{6.9}{12}\\ \\\sin \angle A=\dfrac{\text{opposite leg}}{\text{hypotenuse}}=\dfrac{BC}{AB}=\dfrac{9.8}{12}\\ \\\tan \angle A=\dfrac{\text{opposite leg}}{\text{adjacent leg}}=\dfrac{BC}{AC}=\dfrac{9.8}{6.9}\\ \\\cot \angle A=\dfrac{\text{adjacent leg}}{\text{opposite leg}}=\dfrac{AC}{BC}=\dfrac{6.9}{9.8}

Now

\angle A=\cos^{-1}\left(\dfrac{6.9}{12}\right)\\ \\\angle A=\sin^{-1}\left(\dfrac{9.8}{12}\right)\\ \\\angle A=\tan^{-1}\left(\dfrac{9.8}{6.9}\right)\\ \\\angle A=\cot^{-1}\left(\dfrac{6.9}{9.8}\right)

So, correct options are A, D and F

### Faq

Mathematics

Step-by-step explanation:

yo digo que es eso la verdad no se

Mathematics

Step-by-step explanation:

yo digo que es eso la verdad no se

Mathematics

The answer is in the image

Mathematics

The answer is in the image

Mathematics

For every 8 cars there are 7 trucks

Therefore,

Cars:Truck=8:7

Mathematics

The solution is in the following image

Mathematics

F=ma

where F=force

m=mass

a=acceleration

Here,

F=4300

a=3.3m/s2

m=F/a

=4300/3.3

=1303.03kg

Approximately it is aqual to 1300kg

Mathematics

Salesperson will make 6% of 1800

=(6/100)*1800

=108

Salesperson will make $108 in$1800 sales

Mathematics

The wood before starting =12 feet

Left wood=6 feet

Wood used till now=12-6=6 feet

Picture frame built till now= 6/(3/4)

=8 pieces

Therefore, till now 8 pieces have been made.

Mathematics

The wood before starting =12 feet

Left wood=6 feet

Wood used till now=12-6=6 feet

Picture frame built till now= 6/(3/4)

=8 pieces

Therefore, till now 8 pieces have been made.

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