2 years ago

Suppose A and B are two matrices with the same dimensions. Explain how to find A + B and B - B.

1 answer:

6 0

A+B: the matrix with same dimension a A and B, the element in row i and column j is: Aij+Bij

Same for A-B, but with Aij-Bij

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Brittany and Ashley can paint a room in 7 hours if they work together. If Ashley were to work by himself, it would take him 2 ho

stich3 [128]

Answer:

Step-by-step explanation:

Brittany paints the room in x hours, completing 1/x of the room per hour.

Ashley paints the room in x+2 hours, completing 1/(x+2) of the room per hour.

Working together, they complete 1/x + 1/(x+2) = ⅐ of the room per hour.

7(x+2) + 7x = x(x+2)

14x + 15 = x^2 + 2x

x^2 - 12x - 15 = 0

x = [12 ±√(12²+60)]/2= 6±√51

6-√51 is an extraneous solution.

x = 6+√51 ≈ 13.14

Brittany paints the room in 12.14 hours

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2 years ago

What is the diameter of a circle with a radius of 4.375"? 2.187" or 2.375" or 8.375" or 8.750"

AURORKA [14]

DONT CLICK ON THE LINKS! It’s 8.750 BY THE WAY the radius is half the diameter so just add the radius by itself or multiply by 2

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3 years ago

A Store-It-All storage facility requires users to enter a four digit code, using numbers 0-9, to get through the gate. You need

Tems11 [23]

Take me the brayniest.i hope it was helpful

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2 years ago

Last week, the raito of laptops to desktop sold at a computer store was 2:3. eighteen desktop models were sold. how many laptop

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3 years ago

When the polynomial in P(x) is divided by (x + a), the remainder equals P(a).

Effectus [21]

According to Remainder Theorem for the polynomials, for every polynomial P(x) there exist such polynomials G(x) and R(x), that $P(x)=(x\pm a)G(x)+R(x)$ .

When the polynomial in P(x) is divided by (x + a), then there exist such polynomials G(x) and R(x), that P(x)=(x+a)G(x)+R(x). Note that for x=-a:

P(-a)=(-a+a)G(-a)+R(-a)=0·G(a)+R(-a)=R(-a).
This means that P(-a) is the remainder, not P(a). 
Answer: correct choice is B.

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2 years ago