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4 years ago

Equivalent Expression for 7[2r-3]

Mathematics

1 answer:

Anarel [89]4 years ago

6 0

Answer:

7[2r-3].

Step-by-step explanation:

7[2r-3]

= 7*2r + 7 * -3

=7[2r-3]

You might be interested in

The sum and the difference between the LCM and GCF of two numbers is 252 and 180, respectively. Find the numbers if one of them

Lubov Fominskaja [6]

Answer:

36 and 216

Step-by-step explanation:

Let x and y be LCM and GCF respectively.

We are told that the sum and the difference between the LCM and GCF of two numbers is 252 and 180.

Upon using our information we will get a system of equations.

$x+y=252..(1)$

$x-y=180..(2)$

We will use substitution to solve this system of equations.

$x=180+y$

$180+y+y=252$

$2y=252-180$

$2y=72$

$y=\frac{72}{2} =36$

Now let us find x using equation 1,

$x=252-36=216$

Therefore, LCM is 216 and GCF is 36.

Let a and b our numbers. Now let us find numbers using this information.

We are given that one of them is more than twice the other.

$a>2b$

There can be several such numbers. 36 and 216 can also be numbers. Let us check these numbers.

LCM of 36 and 216 is 216 and GCF is 36 and it satisfies our condition that $a>2b$ because 216 is more than twice 36.

Therefore, our numbers will be 36 and 216.

8 0

4 years ago

What is the factorization of the trinomial below?

lidiya [134]

Answer:

Step-by-step explanation:

4 0

3 years ago

In a box containing 25 cherries, 2 of them are rotten. Susan randomly picks cherries in the box. How many cherries should be pic

KengaRu [80]

Answer:

Susan should pick 6 cherries from box, so the probability of picking the 2 rotten cherries is 1/20

Step-by-step explanation:

assuming that each cherry is equally probable to be chosen , since each cherry is independent from the others and sampling is done without replacement , the random variable X= number of cherries that are rotten from the picked ones follows a hyper geometrical distribution , where

P(X=k)= C(M,k) * C(N-M, n-k) / C(N,n)

where

N= population size = 25

n= number of picks

M = total number of rotten cherries =2

k = number of rotten cherries picked =2

C( ) = combination

then

1/20=C(2,2)*C(25-2,n-2)/C(25,n) = 1 * (23!/(n-2)!*(25-n)! / (25!/(n!*(25-n)!

1/20 = n!/(n-2)! * 1/(24*25)

24*25/20 = n*(n-1)

n²-n-30 =0

n= (1 +√(1+4*1*30))/2 = 12/2= 6

n=6

then Susan should pick 6 cherries from box, so the probability of picking the 2 rotten cherries is 1/20

4 0

3 years ago

James says,

Dima020 [189]

-3^3 = -27

Step-by-step explanation:

Thats because -3^3 is (-3×3×3) not (-3×-3×-3) which we are multiplying a the constant not the the powers

6 0

3 years ago

Read 2 more answers

Pls halp is due today >_<. Thank you

Shkiper50 [21]

Answer:

The square root of 38.

Step-by-step explanation:

The square root of 38 is about 6.16.

The square root of 35 is about 5.91.

The square root of 45 is about 6.70.

The square root of 48 is about 6.92,

So the most reasonable one is the square root of 38, since it is much closer to 6.

3 0

4 years ago