3 years ago

Jeanine is twice as old as her brother Marc. If the sum of their age is 24, how old is Jeanine

Mathematics

2 answers:

Vesna [10]3 years ago

5 0

Jeanine is 12 years old

raketka [301]3 years ago

3 0

Jeanine is 16 years old. Marc is 8 years old.

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A scuba diver starts at 29 meters below the surface and descends until he reaches 67 meters below sea level. How many meters did

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Answer:
38 meters

explanation:
you subtract 29 from 67
(67-29=38)

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3 years ago

Robert gets a loan from his bank. He agrees to borrow £6,000 at a fixed annual simple interest rate of 7%. He also agrees to pay

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Answer:

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Step-by-step explanation:

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3 years ago

Solve the equation cos (x/2) = cos x + 1. what are the solutions on the interval 0° ≤ x < 360°?

Sedbober [7]

Answer:

Step-by-step explanation:

cos (x/2)=cos x+1

cos (x/2)=2cos ²(x/2)

2 cos²(x/2)-cos (x/2)=0

cos (x/2)[2 cos (x/2)-1]=0

cos (x/2)=0=cos π/2,cos (3π/2)=cos (2nπ+π/2),cos(2nπ+3π/2)

x/2=2nπ+π/2,2nπ+3π/2

x=4nπ+π,4nπ+3π

n=0,1,2,...

x=π,3π

or x=180°,540°,...

180°∈[0,360]

so x=180°

2cos(x/2)-1=0

cos (x/2)=1/2=cos60,cos (360-60)=cos 60,cos 300=cos (360n+60),cos (360n+300)

x/2=360n+60,360n+300

x=720n+120,720n+300

n=0,1,2,...

x=120,300,840,1020,...

only 120° and 300° ∈[0,360°]

Hence x=120°,180°,300°

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2 years ago

After 6 days, the mass m, in grams, of

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Step-by-step explanation:

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3 years ago

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storchak [24]

Adds a zero each time?

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3 years ago

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