All categories

3 years ago

F(x) = -2x²-2x+10, find f(2)

Mathematics

1 answer:

beks73 [17]3 years ago

3 0

Answer:

f(2) = -2

Step-by-step explanation:

Substitute 2 everywhere you see an x so f(2) = -2( $2^{2}$ ) - 2(2) + 10 so

f(2) = -2(4) - 4 + 10, so f(2) = -8-4+10, f(2) = -12+10, f(2) = -2

You might be interested in

PLEASE ANSWER, I WILL GIVE BRAINLIEST!!!!!

Gekata [30.6K]

0.65 =

6/10 = 0.6

+

5/100 = 0.05.

Add: 0.6 + 0.05 = 0.65.

Hope this helped☺☺

6 0

2 years ago

Find the volume of the pyramid

podryga [215]

Answer:

88 $cm^{3}$

Step-by-step explanation:

Given 3 measurements 6,11,4

Assuming them to be length, width and height of pyramid

⇒

Length= 6 cm

Width= 11cm

Height= 4 cm

⇒

$\text{Volume of a Pyramid}= \frac{Length \times Width \times Height}{3}$

Therefore Volume of Given Pyramid

= $\frac{6\times 11\times 4}{3} =\frac{264}{3} =88$

⇒Volume of pyramid=88 $cm^{3}$

6 0

2 years ago

Of 1000 randomly selected cases of lung cancer, 823 resulted in death within 10 years.

Arada [10]

Answer:

a) $0.823 - 1.96\sqrt{\frac{0.823(1-0.823)}{1000}}=0.799$

$0.823 + 1.96\sqrt{\frac{0.823(1-0.823)}{1000}}=0.847$

The 95% confidence interval would be given by (0.799;0.847)

b) $n=\frac{0.823(1-0.823)}{(\frac{0.03}{1.96})^2}=621.79$

And rounded up we have that n=622

c) $n=\frac{0.5(1-0.5)}{(\frac{0.03}{1.96})^2}=1067.11$

And rounded up we have that n=1068

Step-by-step explanation:

Part a

$\hat p=\frac{823}{1000}=0.823$

In order to find the critical value we need to take in count that we are finding the interval for a proportion, so on this case we need to use the z distribution. Since our interval is at 95% of confidence, our significance level would be given by $\alpha=1-0.95=0.05$ and $\alpha/2 =0.025$ . And the critical value would be given by: