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3 years ago

Find the slope of the line that contains the points (2,2) and (-7,-4).

Mathematics

2 answers:

disa [49]3 years ago

7 0

$a = - 4 - 2 \div - 7 - 2$

$a = \frac{ - 6}{ - 9}$

Soloha48 [4]3 years ago

3 0

Answer: -6/9, or -2/3

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Four balls of wool will make 8 knitted caps. How many balls of wool will Malcolm need if he wants to make 6 caps

Maksim231197 [3]

4x2=8

3x2=6

so answer is 3

8 0

3 years ago

In order to efficiently bid on a contract, a contractor wants to be 95% confident that his error is less than two hours in estim

Sonja [21]

Answer:

Step-by-step explanation:

Given that in order to efficiently bid on a contract, a contractor wants to be 95% confident that his error is less than two hours in estimating the average time it takes to install tile flooring.

Std deviation =4.5 errors

95% confidence interval = Mean±1.96*std dev

Hence we have

$1.96(\frac{4.5}{\sqrt{n} } )$

$\sqrt{n} \geq 4.41\\n\geq 19.4481$

Sample size should be 20.

8 0

3 years ago

Write 0.083 as a fraction

Naily [24]

Answer:

083/1000.

Step-by-step explanation:

083, means. Since there are 3 digits in 083, the very last digit is the "1000th" decimal place. So we can just say that . 083 is the same as 083/1000.

3 0

3 years ago

Read 2 more answers

Find the exact value of the following expression (without using a calculator): tan(Sin^-1 x/2)

Sati [7]

Answer:

tan(Sin^-1 x/2)= $\frac{x/2}{\sqrt{1-x^{2}/4 } }$

Step-by-step explanation:

Let sin^-1 x/2= θ

then sinθ= x/2

on the basis of unit circle, we have a triangle with hypotenuse of length 1, one side of length x/2 and opposite angle of θ.

tan(Sin^-1 x/2) = tanθ

tanθ= sinθ/cosθ

as per trigonometric identities cosθ= √(1-sin^2θ)

tanθ= sinθ/ √(1-sin^2θ)

substituting the value sinθ=x/2 in the above equation

tanθ= $\frac{x/2}{\sqrt{1-x^{2}/4 } }$

now substituting the value sin^-1 x/2= θ in above equation

tan(sin^-1 x/2) = $\frac{x/2}{\sqrt{1-x^{2}/4 } }$

3 0

3 years ago

Complete the following item. Consult the table above to find the cosine number. Find A to the nearest degree. A ??? degrees.

Romashka [77]

<span>3) This one is a little different, since you're finding the angle instead of the side. You can denote the angle to be the variable x. Thus:
cos x = 14 / 26
Use a calculator to divide out 14/26, then round to four decimals.
cos x = 0.5385
Now go to the cosine chart and find which angle has the cosine 0.5385. It's a strange problem they gave you, because the chart doesn't have a value that matches it (kind of confusing if you ask me). But you can find two angles it is between. Notice that cos 57° = 0.5446 and cos 58° = 0.5299. Thus, the angle must be between those two. It turns out it is closer to 57°, so you can say:
x = 57° </span>

6 0

3 years ago