2 years ago

How estimating helps you check the reasonableness of your answers

Mathematics

1 answer:

I am Lyosha [343]2 years ago

4 0

Whats that supposed to mean-

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Why is the answer D? Plz explain.

Greeley [361]

ΔABC is a right triangle
By the Pythagorean theorem:
AC = √(BC² - AB²) =√(5²-3²) = √(25-9) = √16 = 4

ΔBED is a right triangle
DE = 4
BE = AB + AE = 3 + 4 = 7
By the Pythagorean theorem:
BD = √(BE² + DE²) =√(7²+4²) = √(49+16) = √65

Answer: BD = √65

7 0

2 years ago

Read 2 more answers

Step right up for a brainilest

Aleksandr-060686 [28]

Answer:

0, 2/5, 1/6,-3/4,-7/10

Step-by-step explanation:

this is just what i think i didint understand the no spaces or no commas or negatives thing but here you go i hope its right

5 0

1 year ago

Suppose A is a matrix and k is a positive integer. What does the notation Ak mean?

Butoxors [25]

Answer:

Scalar product

Step-by-step explanation:

The scalar product of a matrix refers to the product of a matrix and a number. The scalar is used to multiply each element in the matrix to get the final vector. In the question the scalar is k which is a constant and the matrix is A.

in the example below 2 is the scalar

$2*\left[\begin{array}{ccc}1&2&3\\4&5&6\\7&8&9\end{array}\right]$