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mojhsa [17]
3 years ago
11

A rectangular book measures 4 x 7. What is the length of its

Mathematics
1 answer:
Crazy boy [7]3 years ago
5 0
B hope that helps have good one
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What is the factored form of the expression?<br><br> 21x^2 + 20x + 4
julia-pushkina [17]

Answer:

21x^2 + 20x + 4 = (3x + 2)(7x + 2).

Step-by-step explanation:

Given the expression is 21x² +20x +4

We can solve the equation as follows:-

21x² +20x +4 = 0

Then a = 21, b = 20, c =4.

Using Quadratic formula, x = ( -b ± √(b² -4ac) )/2a

x = ( -20 ± √(400 - 4*21*4) )/2*21

x = ( -20 ± √(400 - 336) )/42

x = ( -20 ± √(64) )/42

x = ( -20 ± 8 )/42

x = -28/42 or x = -12/42

x = -2/3 or x = -2/7

(x + 2/3) = 0 or (x + 2/7) = 0

Now the factored form can be written as follows:-

(x + 2/3)(x + 2/7) = 0

(3x+2)(7x+2) = 0

Hence, the factored form is 21x^2 + 20x + 4 = (3x+2)(7x+2).

5 0
4 years ago
7. Andre is planting saplings (baby trees). It takes him 30 minutes to plant 3 saplings
kati45 [8]

Answer:

maybe a few hours

Step-by-step explanation:

5 0
3 years ago
A is between B and T. if AB=7y+9, AT=3y+4, and BT=143. find AB
Alenkinab [10]
AB+AT=BT
(7Y+9)+(3Y+4)= 143
10Y+13= 143
10Y= 130
Y=13
AB= 7Y+9
AB= 7*13+9
AB=100
5 0
3 years ago
It takes 30 minutes or less to walk from home to school and back home again when walking at 30m/min to school and walking at 45
erik [133]

Answer:

540m

Step-by-step explanation:

From the question,we are told

It takes 30 minutes or less to walk from home to school and back home again

Time walking to school = 30 or less minutes

Time walking from school = 30 less minutes

Speed walking to school = 30m/min

Speed walking from school = 45m/min

The question asked us to find the Distance between home and school

The formula for Distance covered = Speed × Time

Total distance = Total Speed(m/min) × Total time(minutes)

Let the distance between home and school be represented by x

Time to walk from the house to school = x/ 45m/min + x/ 30m/min

= 30 × x + 45 × x/1350

=( 75x / 1350)

Time to walk from school or to school = 30 minutes of less

= 75x/1350 = 30

75x = 1350 × 30

x = 1350 × 30/75

x = 540m

Therefore, distance between home and school = 540m

4 0
3 years ago
Please help with these few questions!!
Deffense [45]

Step-by-step explanation:

a two -column proof for the following :

Given: angle1 and angle2 form a linear pair and m angle1= 2(m angle2)

Prove : m angle2 =60

10. Write a two-column proof for the following:

Given : AB

5 0
3 years ago
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