3 years ago

Which expression is prime? A) x2 - 9 B) 1 - 9x2 C) 2a2 - 25 D) 4x2 - 9

Mathematics

1 answer:

tiny-mole [99]3 years ago

6 0

The answer would be c

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Micheal took his brother to the movies. Micheal paid regular price, but it cost $2 less for his brother at the child price. It c

iren [92.7K]

It cost $5 for his brother's ticket.

Step-by-step explanation:

Let,

Micheal's ticket price= x

His brother ticket price = y

According to given statement;

x+y=12 Eqn 1

y = x-2 Eqn 2

Putting value of y from Eqn 2 in Eqn 1

$x+(x-2)=12\\x+x-2=12\\2x=12+2\\2x=14\\$

Dividing both sides by 2;

$\frac{2x}{2}=\frac{14}{2}\\x=7$

Putting x=7 in Eqn 2

$y=7-2\\y=5$

It cost $5 for his brother's ticket.

Keywords: linear equation, substitution method

Learn more about linear equations at:

#LearnwithBrainly

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4 years ago

When calculating the circumference of a circle, sometimes the radius is given instead of the diameter. What is the relationship

marin [14]

Answer:

Option A ( radius is twice the daimeter )

Step-by-step explanation:

The relationship between radius and daimeter is given as

Radius² = Daimeter ⇒ r² = d

And cricumference can be calculated with radius

As circumference is 2πr

8 0

2 years ago

Read 2 more answers

Dave's gas tank holds 10 gallons. His car gets at most 25 miles per gallon. How far can he drive

ale4655 [162]

Answer:

m ≤ 250

(where m is miles)

Step-by-step explanation:

He can go a maximum of 250 miles on a tank of gas (25 miles per gallon * 10 gallons), and this can be expressed as follows:

m ≤ 250

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3 years ago

Choose the graph of the linear equation 30x+75y=300

vivado [14]

Answer:

there ya go :)

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Solve for the exact value of x.

egoroff_w [7]

Answer:

x = 4

Step-by-step explanation:

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