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True [87]
3 years ago
8

I need help plz !!!!!

Mathematics
1 answer:
sattari [20]3 years ago
6 0

Answer:

7 gallons

Step-by-step explanation:

brainliest plz if someone else answers

85+125 = 210 (total amount of miles)

unit rate is 30 mi/gal

210 / 30 = 7

7 gallons

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SOMEONE PLEASE HELP IM STUCK AND ITS MY LAST QUESTION
Tems11 [23]

Answer:

Theta=60

Step-by-step explanation:

Lets start to get the value of x in sin(x)=\frac{1}{2}

Just do the opposite which is sin^{-1}(\frac{1}{2}) = 30

So sin(30)=\frac{1}{2}

Still we got only the value of x not theta then

The value of x = theta/2

Theta/2=30 multiply each side by 2

Theta = 60

4 0
3 years ago
Given cosα = −3/5, 180 < α < 270, and sinβ = 12/13, 90 < β < 180
torisob [31]

I got

-  \frac{6 3}{65}

What we know

cos a=-3/5.

sin b=12/13

Angle A interval are between 180 and 270 or third quadrant

Angle B quadrant is between 90 and 180 or second quadrant.

What we need to find

Cos(b)

Cos(a)

What we are going to apply

Sum and Difference Formulas

Basics Sine and Cosines Identies.

1. Let write out the cos(a-b) formula.

\cos(a - b)  =  \cos(a)  \cos(b)  +  \sin(a)  \sin(b)

2. Use the interval it gave us.

According to the given, Angle B must between in second quadrant.

Since sin is opposite/hypotenuse and we are given a sin b=12/13. We. are going to set up an equation using the pythagorean theorem.

.

{12}^{2}  +  {y}^{2}  =  {13}^{2}

144 +  {y}^{2}  = 169

25 =  {y}^{2}

y = 5

so our adjacent side is 5.

Cosine is adjacent/hypotenuse so our cos b=5/13.

Using the interval it gave us, Angle a must be in the third quadrant. Since cos is adjacent/hypotenuse and we are given cos a=-3/5. We are going to set up an equation using pythagorean theorem,

.

( - 3) {}^{2}  +  {x}^{2}  =  {5}^{2}

9 +  {x}^{2}  = 25

{x}^{2}  = 16

x = 4

so our opposite side is 4. sin =Opposite/Hypotenuse so our sin a =4/5.Sin is negative in the third quadrant so

sin a =-4/5.

Now use cosine difference formula

-  \frac{3}{5}  \times  \frac{5}{13}  +   - \frac {4}{5}  \times  \frac{12}{13}

- \frac{15}{65} + (  - \frac{48}{65}  )

-  \frac{63}{65}

Hope this helps

6 0
3 years ago
If it takes 33W of power to move a block for 3s, how much work is done
dem82 [27]

Answer:

power=work done/time

work done= 99N

Step-by-step explanation:

8 0
3 years ago
Read 2 more answers
Please help me with this!!!!!
mihalych1998 [28]

Answer:

The answer is C.

8 0
3 years ago
Which of the following is an appropriate question to ask
Olenka [21]
"What do I want to find out?" is the first step.
4 0
3 years ago
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