3 years ago

Charles buys 10 drinks and 3 sandwiches for $34. Isabel buys 5 drinks and 4

Mathematics

1 answer:

lukranit [14]3 years ago

7 0

Drinks cost $1 and Sandwiches cost $8

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Determine whether 81 − 49n4 is a difference of two squares. If so, factor it. If not, explain why.

Mumz [18]

We have

$81-49n^4=9^2-(7n^2)^2$

so this is indeed a difference of squares. Factorizing would give

$81-49n^4=(9-7n^2)(9+7n^2)$

making the answer D.

We can further factor the first term here and write

$9-7n^2=3^2-(\sqrt 7\,n)^2=(3-\sqrt7\,n)(3+\sqrt7\,n)$

but that's clearly out of the scope of this question.

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2 years ago

What is the coefficient of q in the sum of these two expressions?

Nana76 [90]

Answer:

the two coefficients are 2/3 and -1/6

the sum of the expressions are = 1 /2 q−r+ −3 /4

Step-by-step explanation:

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2 years ago

Find the surface area of the regular hexagonal pyramid shown to the nearest square meter. a. 406 m2 b. 393 m2 c. 819 m2 d. 240 m

elena-s [515]

Answer is A. 406m2 so there is the answer to anyone who comes across this.

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3 years ago

Find the difference . 6 3/5 - 4 3/10 A. 2 0/5 B. 2 1/5 C. 2 3/10 D. 10 9/10

pochemuha

Make improper fractions.

33/5 - 43/10

Find a common denominator, in this case it is 10.

66/10 - 43/10 = 23/10

This can be simplified to 2 3/10

Hope this helps!

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3 years ago

Read 2 more answers

Chang made 6 identical necklaces each having beads and a pendant. The total cost of the beads and pendants for all 6 necklaces w

son4ous [18]

Answer:

One pendant costed $3.40

Step-by-step explanation:

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2 years ago