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Inessa05 [86]
3 years ago
6

Nora has 4 candles on her cake. Maria has 9 more candles than Nora . How many candles Maria have ?

Mathematics
2 answers:
dolphi86 [110]3 years ago
7 0
Nora now has 13 candles
xz_007 [3.2K]3 years ago
3 0
Maria has 13 candles

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Find the product: 42.6 × 15.
garri49 [273]

Answer:

The answer is 639.

Step-by-step explanation:

42.6 × 15

639

8 0
2 years ago
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Explain how to use the distributive property to solve 48 divided by 3
KonstantinChe [14]

We have to divide 48 by 3 using distributive property.

Division using distributive property is used as it is much easier and accurate.

For dividing 48 by 3, we split first 48 as a multiple of 3 and 10

i.e. 48 = 30+18

Now divide again 18 as 3x5 +3

i.e. 48 = 30+15+3

By distributive property we have 48/3 = (30+15+3)/3 =30/3 +15/3 +3/3

Now easier to calclate this

30/3 = 10 : 15/3 =5 and 3/3 =1

Hence 48/3 = 10+5+1=16

8 0
3 years ago
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A vegetable farmer fills of a wooden crate with of a pound of tomatoes. How many pounds of tomatoes can fit into one crate?
7nadin3 [17]

Answer:

a and d

Step-by-step explanation:

The crate can carry any amount up to a pound. Since both b and c are over 1, they can immediately be eliminated. Since both a and d are lower than 1 they can be the answers. if the question tells you to pick all possible answers, pick both a and d but if it says pick one answer, pick a since it is the closest to one pound.

4 0
3 years ago
The thicknesses of 81 randomly selected aluminum sheets were found to have a variance of 3.23. Construct the 98% confidence inte
Yuliya22 [10]

Answer:

The confidence interval for the population variance of the thicknesses of all aluminum sheets in this factory is Lower limit = 2.30, Upper limit = 4.83.

Step-by-step explanation:

The confidence interval for population variance is given as below:

[(n - 1)\times S^{2}  /  X^{2}  \alpha/2, n-1 ] < \alpha < [(n- 1)\times S^{2}  / X^{2} 1- \alpha/2, n- 1 ]

We are given

Confidence level = 98%

Sample size = n = 81

Degrees of freedom = n – 1 = 80

Sample Variance = S^2 = 3.23

X^{2}_{[\alpha/2, n - 1]}   = 112.3288\\\X^{2} _{1 -\alpha/2,n- 1} = 53.5401

(By using chi-square table)

[(n – 1)*S^2 / X^2 α/2, n– 1 ] < σ^2 < [(n – 1)*S^2 / X^2 1 -α/2, n– 1 ]

[(81 – 1)* 3.23 / 112.3288] < σ^2 < [(81 – 1)* 3.23/ 53.5401]

2.3004 < σ^2 < 4.8263

Lower limit = 2.30

Upper limit = 4.83.

8 0
2 years ago
The question is in the picture.
dangina [55]
<h2><u>Part A:</u></h2>

Let's denote no of seats in first row with r1 , second row with r2.....and so on.

r1=5

Since next row will have 10 additional row each time when we move to next row,

So,

r2=5+10=15

r3=15+10=25

<u>Using the terms r1,r2 and r3 , we can find explicit formula</u>

r1=5=5+0=5+0×10=5+(1-1)×10

r2=15=5+10=5+(2-1)×10

r3=25=5+20=5+(3-1)×10

<u>So for nth row,</u>

rn=5+(n-1)×10

Since 5=r1 and 10=common difference (d)

rn=r1+(n-1)d

Since 'a' is a convention term for 1st term,

<h3><u>⇒</u><u>rn=a+(n-1)d</u></h3>

which is an explicit formula to find no of seats in any given row.

<h2><u>Part B:</u></h2>

Using above explicit formula, we can calculate no of seats in 7th row,

r7=5+(7-1)×10

r7=5+(7-1)×10 =5+6×10

r7=5+(7-1)×10 =5+6×10 =65

which is the no of seats in 7th row.

8 0
3 years ago
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