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3 years ago

What is the distributive property of 9 and 15?

Mathematics

1 answer:

Vikentia [17]3 years ago

3 0

$9(15) = 9 \times 1 + 9 \times 5 = 54$

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The equation x^2 + y^2 + 21 = 40 + 18y. What is the radius of this cookie?

trapecia [35]

Answer:

The radius is 10

Step-by-step explanation:

Given

$x^2 + y^2 + 21 = 40 + 18y.$

Required

The radius

Rewrite as:

$x^2 + y^2 - 18y = 40-21$

Subtract 81 from both sides

$x^2 + y^2 - 18y +81= 40-21+81$

Expand

$x^2 + y^2 - 9y - 9y +81= 40-21+81$

Factorize

$x^2 + y( y- 9) - 9(y -9)= 40-21+81$

Factor out y - 9

$x^2 + (y- 9) (y -9)= 40-21+81$

Express as squares

$x^2 + (y- 9)^2= 100$

$x^2 + (y- 9)= 10^2$

The equation of a circle is:

$(x - a)^2 + (y- b)= r^2$

By comparison:

$r^2=10^2$

$r = 10$

6 0

3 years ago

When ordering the kids lunch at burger university the customer must choose a size whether or not to have cheese a type a bun I s

Sav [38]

Dont be stingy with brainliest 1st of all
the awnser is 256.
because you take the amount of choices (c1 *c2*c3*c4*c5)
4*2*2*4*4= 8*2*4*4=16*4*4=64*4=256

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4 years ago

Students who party before an exam are twice as likely to fail as those who don't party (and presumably study). If 20% of the stu

True [87]

Answer:

The fraction of the students who failed to went partying = $\frac{1}{10}$

Step-by-step explanation:

Let total number of students = 100

No. of students partied are twice the no. of students who not partied.

⇒ No. of students partied = 2 × the no. of students who are not partied

No. of students partied before the exam = 20 % of total students

⇒ No. of students partied before the exam = $\frac{20}{100}$ × 100

⇒ No. of students partied before the exam = 20

No. of students who not partied before the exam = $\frac{20}{2} = 10$

Thus the fraction of the students who failed to went partying = $\frac{10}{100} = \frac{1}{10}$

8 0

3 years ago

Bethany sent 60 text messages she said that 15% of those messages were to her best friend.How many text messages did bethany sen

Troyanec [42]

60 x .15=9 She sent 9 text messages to her friend

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3 years ago

Read 2 more answers

Can someone help me with this little question?

Nonamiya [84]

Answer:

Step-by-step explanation:

y=12249(0.9431)

7 0

3 years ago