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OLga [1]
3 years ago
8

Please solve these questions with the equations. Will give 80 points and mark brainliest to the person with the answers.

Mathematics
1 answer:
I am Lyosha [343]3 years ago
5 0

1]

8(x-7)=128 \ \ /:8\\\\x-7=16 \ \ /+7\\\\\huge\boxed{x=23}

2]

16=2(x+7) \ \ /:2\\\\x+7=8 \ \ /-7\\\\\huge\boxed{x=1}

3]

\frac{7y}{7}=20\\\\\huge\boxed{y=20}

4]

2x-1=9 \ \ /+1\\\\2x=10 \ \ /:2\\\\\huge\boxed{x=5}

5]

2(x-8)=20 \ \ /:2\\\\x-8=10 \ \ /+8\\\\\huge\boxed{x=18}

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How many solutions does the equation cos(6x)=1/2 have on the interval (0, 2pi)?
Lina20 [59]
Cos( 6 x ) = 1/2          
6 x = 60°  ⇒ x 1 = 10°
6 x = 300° ⇒ x 2 = 50°
6 x = 420° ⇒ x 3 = 70°
6 x  = 660° ⇒ x 4 = 110°
x 5 = 130°,  x 6 = 170°,  x 7 = 190° , x 8 = 230°, x 9 = 250°,
x 10 = 290°, x 11 = 310°, x 12 = 350°
Answer: there are 12 solutions on the interval ( 0 , 2π ).
6 0
3 years ago
Read 2 more answers
4 whols and 4/5 divided by 4/5
Andre45 [30]

Answer:

6

Step-by-step explanation:

4\frac{4}{5} ÷ \frac{4}{5}

= \frac{24}{5} ÷ \frac{4}{5}

= \frac{24}{5} * \frac{5}{4}

= \frac{120}{20}

= 6

5 0
3 years ago
How long does it take a runner to run 12km if he is running at a speed of 7km/h
Rama09 [41]

Answer:

about an hour and 42 minutes

Step-by-step explanation:

Time=Distance/Speed

3 0
3 years ago
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the equation 4(x+9)=76 models this situation which choice shows the sequence of operations neede to slove this problem using bot
laiz [17]

Answer:

Step-by-step explanation:

Here you go mate

Use PEMDAS

Parenthesis,Exponent,Multiplication,Division,Addition,Subtraction

Step 1

4(x+9)=76  Equation/Question

Step 2

4(x+9)=76  Remove parenthesis by multiplying 4

4x+36=76

Step 3

4x+36=76  Subtract 36 from sides

4x=40

Step 4

4x=40  Divide sides by 4

answer

x=10

Hope this helps

5 0
3 years ago
NEED HELPPPPP LOL XDDDDD OH MY GODDD
DedPeter [7]

Answer:

yo w t f is thisssssss

Step-by-step explanation:

b  c  idek im so cluless rn im in 7th grade XD

8 0
3 years ago
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