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3 years ago

5. Simplify when a = 4 and b = 3; 2a – 21 ÷ b *

Mathematics

2 answers:

Sever21 [200]3 years ago

8 0

Answer:

Step-by-step explanation:

insert the values for a and b and solve.

kow [346]3 years ago

4 0

The answer is one because of pemdas but first you fill the letters with the suppose number and then do your pemdas steps

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Consider the following hypothesis test: H 0: 20 H a: < 20 A sample of 50 provided a sample mean of 19.4. The population stand

goblinko [34]

Answer: p-value is 0.016.

Step-by-step explanation:

Since we have given that

$H_0:\mu=20\\\\H_a:\mu$

Sample mean = 19.4

Sample size n = 50

Standard deviation = 2

We need to find the test statistic value which is given by

$z=\dfrac{\bar{x}-\mu}{\dfrac{\sigma}{\sqrt{n}}}\\\\\\z=\dfrac{19.4-20}{\dfrac{2}{\sqrt{50}}}\\\\\\z=\dfrac{-0.6}{0.28}\\\\z=-2.14$

p-value is given by

$P(Z>Z_{critical})\\\\=P(Z>-2.14)\\\\=0.016$

Hence, p-value is 0.016.

8 0

3 years ago

5. Find the surface area of the cone. Round to<br> the nearest hundredth.<br> 2 ft<br> 6 ft

den301095 [7]

Answer:

$52.3m^2$

Step-by-step explanation:

Use these formulas

$A=\pi rl+\pi r^2\\l=\sqrt{r^2+h^2}$

Now solve

$A=\pi r(r+\sqrt{h^2+r^2} )\\=\pi *2*(2\sqrt{6^2+2^2} )\\=52.3m^2$

4 0

3 years ago

Which expression is equivalent to (7x3)2(x3)?

astraxan [27]

Answer:

(21)+(6) is an equivalent expression

Step-by-step explanation:

(7x3)2(x3)

(21)+(6)

8 0

3 years ago

Solve the inequality <br> -7<3x+5 less than or equal to(no sign for that)7

olganol [36]

Answer:

x=-1

Step-by-step explanation:

-7 < 3(x) + 5 ≤ 7

-7 < 3(-1) + 5 ≤ 7

-7 < -3 + 5 ≤ 7

-7 < 2 ≤ 7

6 0

3 years ago

Find the following when a = -3, b = 6, c = −4/5 9b−72a+1

Vadim26 [7]

271.

Hope this helped!

8 0

3 years ago