Ask question

Ask question

All categories

2 years ago

10

(a) Draw the vectors a=[3, 2], b=[2,-1], and c=[7, 1]. (b) Show, by means of a sketch, that there are scalars s and t such that

c=sa+tb. (c) use the sketch to estimate the values of s and t. (d) Find the exact values of s and t.

1 answer:

UNO [17]2 years ago

4 0

Answer:

4

Step-by-step explanation:

s is 2,1 t is 1

You might be interested in

Como que c faz conta de raiz quadrada?

sineoko [7]

Answer:

could u say it in english and is it a multiple chice?

Step-by-step explanation:

7 0

2 years ago

7 divided into 2 what's the answer

Alex17521 [72]

3.5 hope this helps C:

4 0

2 years ago

Read 2 more answers

Which pair of functions are inverse of eachother ?

Doss [256]

Answer: a

Step-by-step explanation:

6 0

3 years ago

You want to obtain a sample to estimate how much parents spend on their kids birthday parties. Based on previous study, you beli

zhuklara [117]

Answer:

We need to sample at least 1069 parents.

Step-by-step explanation:

We have that to find our $\alpha$ level, that is the subtraction of 1 by the confidence interval divided by 2. So:

$\alpha = \frac{1-0.9}{2} = 0.05$

Now, we have to find z in the Ztable as such z has a pvalue of $1-\alpha$ .

So it is z with a pvalue of $1-0.05 = 0.95$ , so $z = 1.645$

Now, find the margin of error M as such

$M = z*\frac{\sigma}{\sqrt{n}}$

In which $\sigma$ is the standard deviation of the population and n is the size of the sample.

How many parents do you have to sample?

We need to sample at least n parents.

n is found when $M = 4, \sigma = 79.5$ . So

$M = z*\frac{\sigma}{\sqrt{n}}$

$4 = 1.645*\frac{79.5}{\sqrt{n}}$

$4\sqrt{n} = 1.645*79.5$

$\sqrt{n} = \frac{1.645*79.5}{4}$

$(\sqrt{n})^{2} = (\frac{1.645*79.5}{4})^{2}$

$n = 1068.92$

Rounding up

We need to sample at least 1069 parents.

6 0

3 years ago

Read 2 more answers

Solve each system by graphing

Ne4ueva [31]

2,-4 is you awnser. good day to you

5 0

3 years ago