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Yakvenalex [24]

3 years ago

14

A science teacher needs to choose 12 students out of 16 to serve as peer tutors how many different ways can the teacher choose t

he12 students

2 answers:

AlexFokin [52]3 years ago

7 0

He can ask the student to raise their hands and pick them

Mkey [24]3 years ago

4 0

the teacher can ask them to pick the closest number. the teacher can choose the students with the highest grades.

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If a = {6 6 4 7 -4 4 -6 9 -3} and B= {1 5 -8 9 -5 -8 9 -5 2}, find 3a +9B Matrix operations

V125BC [204]

Answer:

$3A+9B=\begin{bmatrix} 27 & 63 & -60 \\\\ 102 & -57 & -60\\\\ 63 & -18 & 9 \end{bmatrix}$

Step-by-step explanation

$A=\begin{bmatrix} 6 & 6 & 4\\\\7 & -4 & 4\\\\ -6 & 9 & -3\end{bmatrix}\: and \: B=\begin{bmatrix}1 & 5 & -8\\\\ 9 & -5 & -8\\\\ 9 & -5 & 2\end{bmatrix}$

$\rightarrow 3A=3\begin{bmatrix} 6 & 6 & 4\\\\7 & -4 & 4\\\\ -6 & 9 & -3\end{bmatrix},\: \: 9B =9\begin{bmatrix}1 & 5 & -8\\\\ 9 & -5 & -8\\\\ 9 & -5 & 2\end{bmatrix}$

$\rightarrow 3A=\begin{bmatrix} 3*6 & 3*6 & 3*4\\\\3*7 & 3(-4) & 3*4\\\\ 3(-6) & 3*9 & 3(-3)\end{bmatrix},\:\: 9B =\begin{bmatrix}9*1 &9* 5 &9( -8)\\\\ 9*9 & 9(-5) & 9(-8)\\\\ 9*9 & 9(-5) & 9*2\end{bmatrix}$

$\rightarrow 3A=\begin{bmatrix} 18 & 18 & 12 \\\\ 21 & -12 & 12\\\\ -18 & 27 & -9\end{bmatrix},\:\: 9B =\begin{bmatrix} 9 & 45 & -72 \\\\ 81 & -45 & -72\\\\ 81 & -45 & 18\end{bmatrix}$

$\rightarrow 3A+9B=\begin{bmatrix}18+9 & 18+45 & 12+(-72) \\\\ 21+81 & -12 +(-45) & 12+(-72)\\\\ -18+81 & 27+(-45) & -9+18 \end{bmatrix}$

$\rightarrow 3A+9B=\begin{bmatrix} 18+9 & 18+45 & 12-72 \\\\ 21+81 & -12 -45 & 12-72\\\\ -18+81 & 27-45 & -9+18 \end{bmatrix}$

$\rightarrow \purple{\bold{3A+9B=\begin{bmatrix} 27 & 63 & -60 \\\\ 102 & -57 & -60\\\\ 63 & -18 & 9 \end{bmatrix}}}$

6 0

2 years ago

Please help, i cannot solve.

Ludmilka [50]

Im sorry im in sixgh grade i was so close to solving it but that didnt work, i tried

3 0

3 years ago

The South Company cash account had a balance of $1,202.50 on January 31. A deposit, made on the 31st, in the amount of $100.05 w

labwork [276]

Answer:

$1326

Step-by-step explanation:

Follow the format of the reconciliation statement

The adjusted cash balances should match

Cash balance as per the bank statement, January 31 1421.95

Add: Deposit in transit 100.05

Deduct: Outstanding checks <u>(196)</u>

Adjusted cash balance <u>1326</u>

Balance as per depositor's record, January 31 1202.5

Subtract: NSF check (18)

Subtract: Service charges (8.5)

Add: receivable collected <u>150</u>

Adjusted cash balance <u>1326</u>

The reconciled amount is $1326.

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8 0

3 years ago

Help ASAP PLEASE!!!

Oxana [17]

1st drop(.71) 2nd drop(-1.22)

3 0

3 years ago

Is this tangent to the circle?

erica [24]

Hello,

Yes since (2*6.4)²+9.6²=256=16²
Angle A=90°

5 0

3 years ago

Read 2 more answers