3 years ago

All 3 of these plz ??

Mathematics

1 answer:

LenaWriter [7]3 years ago

6 0

Number 3 / last one is -49 hoped I helped you

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Lena walks 2.5km every day. How far does she walk in 7 days? Write your answer in meters.

Marat540 [252]

Answer:

17.5 meters

Step-by-step explanation:

To find how far she walks, multiply 2.5 by 7

2.5(7)

= 17.5

So, in 7 days, she walks 17.5 meters

6 0

3 years ago

10) (k - 9) (5k - 8)

zalisa [80]

5k²-8k-45k+72 = 5k²-53k+72

Answer: 5k² - 53k + 72

7 0

3 years ago

A tub is filled with 18000 cm3 of water. It loses one-tenth of its water every 12 hours. What volume of water would be remaining

Lina20 [59]

Answer:

0 cm³

Step-by-step explanation:

the lost of water =

(5×24)/12 x 1/10 × 18000

= 10/10 × 18000 = 18,000 cm³

so, the remaining water in the tub=

18,000 - 18,000 = 0 cm³

(the tub is empty)

6 0

3 years ago

Evaluate A + 3B if possible. HELP ASAP!

madreJ [45]

Answer:

Not possible.

Step-by-step explanation:

Addition of Matrix A and Matrix B is possible only if the order of matrix A is same as the order of matrix B.

Order of a matrix with $m$ rows and $n$ columns is $m\times n$ .

Here, matrix A is $\left[\begin{array}{ccc}2&-4\\-4&10\\0&-8\end{array}\right]$

Matrix B is $\left[\begin{array}{ccc}0&-4&6\\2&-10&4\end{array}\right]$ .

Multiplying a matrix by a constant doesn't change its order.

So, order of matrix A is $3\times 2$ as it has 3 rows and 2 columns.

The order of matrix 3B is $2\times 3$ as it has 2 rows and 3 columns.

Therefore, addition is not possible as the order is different.

4 0

3 years ago

HELP FAST!!! WILL GIVE BRAINLIEST ANSWER!!!! AND POINTS!!!

Tanzania [10]

Answer:

SAS

Step-by-step explanation:

6 0

2 years ago