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3 years ago

Estimate the product of 51 and 48

Mathematics

2 answers:

MariettaO [177]3 years ago

7 0

51*48
rounds to
50*50
which equals
2500

zalisa [80]3 years ago

3 0

So first you have to find the estimation of 51 which is = 50 Next you find the estimation of 48. 48 is closest to 50 so it's estimation is = 50 Finally you multiply those together and get = 2500 The real answer without estimation is 2,400

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The arithmetic sequence a_ia i a, start subscript, i, end subscript is defined by the formula: a_1 = 15a 1 =15a, start subsc

daser333 [38]

Answer:

-1,512,390

Step-by-step explanation:

Given

a1 = 15

$a_i = a_{i-1} -7$

Let us generate the first three terms of the sequence

$a_2 = a_{2-1}-7\\a_2 = a_1 - 7\\a_2 = 15-7\\a_2 = 8$

For $a_3$

$a_3 = a_{3-1}-7\\a_3 = a_2 - 7\\a_3 = 8-7\\a_3 = 1$

Hence the first three terms ae 15, 8, 1...

This sequence forms an arithmetic progression with;

first term a = 15

common difference d = 8 - 15 = - -8 = -7

n is the number of terms = 660 (since we are looking for the sum of the first 660 terms)

Using the formula;

$S_n = \frac{n}{2}[2a + (n-1)d]\\$

Substitute the given values;

$S_{660} = \frac{660}{2}[2(15) + (660-1)(-7)]\\S_{660} = 330[30 + (659)(-7)]\\S_{660} = 330[30 -4613]\\S_{660} = 330[-4583]\\S_{660} = -1,512,390$

Hence the sum of the first 660 terms of the sequence is -1,512,390

6 0

3 years ago

What is the area of the trapezoid?

zzz [600]

Answer:

256m2.

Step-by-step explanation:

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Jessica weighs 10 less than three times as much as her little sister. If x represents her sister's weight, what is an expression

IrinaK [193]

Answer:

Step-by-step explanation:

J=3x-10

We are told Jessica weighs 10 less than 3 times her sister’s weight and told that her sister’s weight was x.

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Wittaler [7]

Answer:

I think the better deal is $8.78.

Step-by-step explanation:

I think this because half of twenty is 10, and half of 12 is 6. The twelve pack price is closer to one dollar a can, and the 20 pack's is further. :) i hope this helps you!

(plz brainliest! :) )

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3 years ago

The number 0.8 can be written as 8/10, so it is an irrational number? true or false

Marat540 [252]

It is not an irrational number

3 0

3 years ago