answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
zimovet
2 months ago
15

sari has 3 times as many pencil erasers Sam. Together, they have 28 erasers.  How many erasers does Sari have

Mathematics
2 answers:
zzz [12.3K]2 months ago
7 0
Sari has 21 erasers.
PIT_PIT [12.4K]2 months ago
4 0
Start by letting x represent the number of Sam's pencils. Then Sari has 3x (since she has three times as many)

Together they total 28 pencils:
x + 3x = 28
4x = 28  /:4 (divide both sides by 4)
x = 7
So Sam has 7 pencils.
Sari, having three times as many, has 7 * 3 = 21.[[TAG_8]]
You might be interested in
Jala put $600 in an interest bearing account with a annual compound interest rate of 5%. Jala determined that after seven years,
Svet_ta [12734]

Answer:

The correct answer is 7.4 years

4 0
2 months ago
Read 2 more answers
Identify the errors made in finding the inverse of y = x2 + 12x. An image shows a student's work. Line 1 is x = y squared + 12 x
Svet_ta [12734]

Answer:

The three errors are:

1) Incorrectly swapping the variables x and y.

2) Failure to use the ± symbol.

3) The domain is wrong; it should be x ≤ 0.

Step-by-step explanation:

Review the following steps.

y = x^2 + 12x

Step 1: x = y^2 + 12x

The initial step is incorrect because the variables x and y were switched improperly; it should be:

x=y^2+12y

Step 2: y^2= x-12x

Step 3: y^2= -11 x

Step 4: y=\sqrt{-11x}, for x ≥ 0

Step 4 contains an error as the ± sign is required. Additionally, the function's domain is inaccurately stated.

The radicand must be nonnegative, implying that x must satisfy x ≤ 0.

4 0
3 months ago
Read 2 more answers
4/9 divided by what equals 12?<br> :)
Inessa [12570]

Answer:

To solve (4/9)/x = 12, multiply both sides by x to get (4/9) = 12x. Then, divide both sides by 12. The answer is 27.

I hope this is helpful!

4 0
2 months ago
Read 2 more answers
Given: KL ║ NM , LM = 45, m∠M = 50° KN ⊥ NM , NL ⊥ LM Find: KN and KL
Leona [12618]

Answer:

KL=45\tan 50^{\circ}\sin 50^{\circ}\approx 41.08\\ \\KN=45\sin 50^{\circ}\approx 34.47

Step-by-step explanation:

Given:

KL ║ NM,

LM = 45

m∠M = 50°

KN ⊥ NM  

NL ⊥ LM

To determine: KN and KL

1. Analyzing triangle NLM, we see it is a right triangle due to NL ⊥ LM. In this context,

LM = 45

m∠M = 50°

Consequently,

\tan \angle M=\dfrac{\text{opposite leg}}{\text{adjacent leg}}=\dfrac{NL}{LM}=\dfrac{NL}{45}\\ \\NL=45\tan 50^{\circ}

It is also true that

(angles LNM and M are complementary).m\angle LNM=90^{\circ}-50^{\circ}=40^{\circ}

2. Now considering triangle NKL, it also forms a right triangle as KN ⊥ NM. Within this triangle,

NL=45\tan 50^{\circ}

m\angle KLN=m\angle LNM=40^{\circ} (alternate interior angles)

m\angle KNL=90^{\circ}-40^{\circ}=50^{\circ} (angles KNL and KLN are complementary).

Thus,

\sin \angle KNL=\dfrac{\text{opposite leg}}{\text{hypotenuse}}=\dfrac{KL}{LN}=\dfrac{KL}{45\tan 50^{\circ}}\\ \\KL=45\tan 50^{\circ}\sin 50^{\circ}\approx 41.08

and

\cos \angle KNL=\dfrac{\text{adjacent leg}}{\text{hypotenuse}}=\dfrac{KN}{LN}=\dfrac{KN}{45\tan 50^{\circ}}\\ \\KN=45\tan 50^{\circ}\cos 50^{\circ}=45\sin 50^{\circ}\approx 34.47

3 0
2 months ago
Read 2 more answers
Other questions:
  • If  BD BC, BD = 5x – 26, BC = 2x + 1, and AC = 43, find AB.
    5·1 answer
  • Label the place value 12,354.897
    5·2 answers
  • Molly has a $2500 down payment saved for this purchase, and the dealer's $1500 Cash Allowance will come straight off her total.
    14·2 answers
  • A $5000 principal is invested in two accounts, one earning 1% interest and the another earning 6% interest. If the total interes
    6·1 answer
  • All the fourth-graders in a certain elementary school took a standardized test. A total of 85% of the students were found to be
    15·1 answer
  • A 12-centimeter rod is held between a flashlight and a wall as shown. Find the length of the shadow on
    14·1 answer
  • Maximum value of x3y3 + 3 x*y when x+y = 8.
    10·2 answers
  • Sal bought 2 shirts and a hat. Sal remembers each shirt was $10, and the total was $50. Which equation helps answer the question
    9·1 answer
  • A sample of 14 joint specimens of a particular type gave a sample mean proportional limit stress of 8.48 MPa and a sample standa
    13·1 answer
  • Tran flips a coin 4 times. Which is true? Select two answers.
    11·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!