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olchik [2.2K]
3 years ago
10

Mrs.Kennedy is buying pencils for each of 315 students at Hamilton Elementary. The pencils are sold in boxes of tens. How can sh

e use rounding to decide how many pencils to buy?
Mathematics
2 answers:
ycow [4]3 years ago
5 0
Since 5 is closer to 10 then it is to zero, the tens column will be pushed up by one. the answer is-
320. she will have 5 extra pencils
g100num [7]3 years ago
4 0

Mrs Kennedy is buying pencils for 315 students.

The pencils are sold in boxes of 10.

Therefore the number of pencils she needs to buy should be a multiple of 10, so that she can buy boxes of 10 pencils each.

number of students are 315 but 315 is not a multiple of 10

so we have to round off 315 to the nearest ten, that's 320.

so then she has to buy 320 pencils

number of boxes she needs - 320 / 10 = 32 boxes of pencils

she only needs pencils for 315 students so she will have 5 extra pencils

she will have to buy 32 boxes

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H=3+14t-5t^2 <br> What is its maximum height
timurjin [86]

Answer:

12.8

Step-by-step explanation:

Given a parabola in standard form , ax² + bx + c : a ≠ 0

Then the x- coordinate of the vertex is

x_{vertex} = - \frac{b}{2a}

h = 3 + 14t - 5t² ← is in standard form

with a = - 5 and b = 14, thus

x_{vertex} = - \frac{14}{-10} = 1.4

Substitute t = 1.4 into h for maximum height

h = 3 + 14(1.4) - 5(1.4)²

   = 3 + 19.6 - 9.8 = 12.8

5 0
4 years ago
What is the y value when x is -5? What about 5?
topjm [15]
-5 is between -2 and -10 So you use that problem
-20 + 11 = -9

When you use 5. It is between 2 and 10. So you use that problem
5+ 1 = 6
6 0
3 years ago
−x+10=−5<br><br> Please help and include step by step.
sergey [27]

Step by Step:

Step 1.) Subract 10 from both sides.

Step 2.) Divide each side by one



answer: x=15

3 0
4 years ago
Read 2 more answers
The numbers in green represent mika's random sample of 10 acres. What is the average number of coconut palms on the randomly cho
Alexandra [31]

Answer:

The answers to the questions are

a) The average number of coconut palms on the randomly chosen side is 49.5 coconut  palms

b)  The projected number of palms on the entire farm is 3168 coconut palms.

Step-by-step explanation:

(a) The average is given by ∑fx/∑f = (∑x)/n

The sum of the number of coconut palms in the random sample of 10 acres is as follows

∑x = 56+43+62+63+33+34+38+51+59+56 = 495

n = 10

Therefore the average = 495/10 = 49.5 palm tree per acres

The average number of palm tree per acre = 49.5 palm tree

b) To project the number of coconut palms on the entire farm, we note that the average palm tree per acre = 49.5 coconut  palms

Number of acres = 64

∴ Projected number of coconut  palms in the farm = (Average number of palm tree per acre) × (Number of acres in the farm)

= 64 × 49.5 = 3168 coconut palms.

4 0
3 years ago
Translate into an algebraic expression.
OleMash [197]
It is a because 3/4 v is times 2/9 6 times so the answer ins a
5 0
3 years ago
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