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Sholpan [36]
2 years ago
6

Jane has a pile of 6 books. Together, the books weigh 4 pounds. If the books are

Mathematics
2 answers:
VARVARA [1.3K]2 years ago
8 0

Answer:

I think it is 2 pounds correct me if I am wrong

Step-by-step explanation:

nirvana33 [79]2 years ago
3 0

Answer:

2lb-

Step-by-step explanation:

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Solve the equations by factoring:<br><br>x^2−3x−40=0<br><br>4x^2−81=0
Alja [10]

Answer:

see explanation

Step-by-step explanation:

Given

x² - 3x - 40 = 0

Consider the factors of the constant term (- 40) which sum to give the coefficient of the x- term (- 3)

The factors are - 8 and + 5, since

- 8 × 5 = - 40 and - 8 + 5 = - 3, thus

(x - 8)(x + 5) = 0 ← in factored form

Equate each factor to zero and solve for x

x - 8 = 0 ⇒ x = 8

x + 5 = 0 ⇒ x = 5

------------------------------------------------------

Given

4x² - 81 = 0 ← this is a difference of squares and factors in general as

a² - b² = (a + b)(a - b), thus

4x² - 81

=(2x)² - 9²

= (2x + 9)(2x - 9) = 0 ← in factored form

Equate each factor to zero and solve for x

2x + 9 = 0 ⇒ 2x = - 9 ⇒ x = - \frac{9}{2}

2x - 9 = 0 ⇒ 2x = 9 ⇒ x = \frac{9}{2}

8 0
3 years ago
Read 2 more answers
Complete the sentence.<br> In the formula C=2r. C stands for
AleksAgata [21]

Answer:

Circumference

3 0
3 years ago
Read 2 more answers
A photograph 8 cm by 11 cm will be framed. The combined area of the frame and photograph will be 180 cm^2. Algebraically determi
SCORPION-xisa [38]

Answer:

12 cm x 15 cm

Step-by-step explanation:

if the picture frame thickness is x,

then the frame dimension would be (8+2x) cm by (11+2x) cm

area is (8+2x)(11+2x)=180

solve for x, x= 2, -23/2

x is thickness, so should be >0, so x=2

frame dimension:  12 x 16

8 0
2 years ago
How many times greater is the value of the 3 in 342 then the value of the 3 in 13?
Leya [2.2K]
It is 100 times greater.
5 0
3 years ago
Read 2 more answers
Mathsgenie.co.uk
ioda

Answer:

180

Step-by-step explanation:

For each boy you choose, you choose one of the 15 girls.

This is the counting principle.

12 * 15 = 180

Answer: 180

6 0
3 years ago
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