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2 years ago

All I need is help on these two so plz help me finish !!

Mathematics

2 answers:

aivan3 [116]2 years ago

5 0

Answer:5.86 9.26

Step-by-step explanation:

lara [203]2 years ago

5 0

Answer:

For the first one it's 53 small cubes can fit in the right rectangle prism. For the second one the answer is A=120

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2 1/2x + 1/4 + 3/4x = 1/8

Vinil7 [7]

$\frac{5}{2}x+\frac{1}{4} +\frac{3}{4} x=\frac{1}{8} \\\\\frac{5}{2}(8)x+\frac{1}{4} (8)+\frac{3}{4}(8) x=\frac{1}{8}(8)\\20x+2+6x=1\\20x+6x=1-2\\26x=-1\\\frac{26x}{26} =\frac{-1}{26} \\x=-\frac{1}{26}$

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7 months ago

An SRS of 450 450 high school seniors gained an average of ¯ x = 20 x¯=20 points in their second attempt at the SAT Mathematics

maria [59]

Answer: (15.47, 24.53)

Step-by-step explanation:

We know that the confidence interval for population mean is given by :_

$\overline{x}\pm z^*\dfrac{\sigma}{\sqrt{n}}$

, where n= sample size.

$\sigma$ = standard deviation.

$\overline{x}$ = sample mean.

z*= Critical value.

Given : n= 450

$\overline{x}=20$

$\sigma=49$

Critical value for 95% confidence = z*=1.96 [From z-value table]

Then, the 95% confidence interval will be :-

$20\pm (1.96)\dfrac{49}{\sqrt{450}}$

$\approx 20\pm (1.96)(2.31)$

$\approx 20\pm 4.53$

$=(20-4.53,\ 20+4.53)=(15.47,\ 24.53)$

Hence, the 95% confidence interval for the mean change in score μ μ in the population of all high school seniors. : (15.47, 24.53)

3 0

2 years ago

Slove for all the possible values of x. √21-4x=x-6

Alona [7]

Answer:

x=2.116

Step-by-step explanation:

$\sqrt{21}$ -4x=x-6

4.58-4x-x=-6

-5x=-6-4.58

-5x=-10.58

x=2.116

4 0

2 years ago

Whats 290 x 4000 pls help

tigry1 [53]

Answer: it’s 1160000

Step-by-step explanation: hope I helped:)

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2 years ago

Read 2 more answers

Order these numbers from Least to Greatest 4,209 2,438 4,703 3,026

Virty [35]

2,438 3,026 4,209 4,703

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3 years ago