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3 years ago

Joes score increased by 7 is 67

Mathematics

2 answers:

Virty [35]3 years ago

6 0

his score was increased... so if he is now at 67 and it was increased by 7 so his first grade would have been 60.

Evgen [1.6K]3 years ago

4 0

Answer:

if joes score increased by 7 and is 67 that means that before, he had 60 points

Step-by-step explanation:

hope this helps ;)

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Maslowich

Answer:

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Step-by-step explanation:

All you do is count the numbers in the place value chart.

Since 31-18=13, all you do is count 10+1+1+1=13.

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Katena32 [7]

Step-by-step explanation:

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2 years ago

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3 years ago

In Applied Life Data Analysis (Wiley, 1982), Wayne Nelson presents the breakdown time of an insulating fluid between electrodes

Ede4ka [16]

Answer:

xbar=14.3421

s=18.7920

Step-by-step explanation:

sample mean

xbar = ∑x/n = (0.20 + 0.73 + 0.99 +1.29 + 2.84 + 3.34 + 4.07 + 4.69 + 4.86 + 6.53 + 7.45 + 8.07 + 8.21 + 12.39 + 31.67 + 32.53 + 33.92 + 36.00 +72.72)/19=14.3421

where n stands for the size of the sample

sample deviation

s= $\sqrt{}$ (∑ $(x_i - x bar )^2$ /(n-1)) = $\sqrt{}$ (∑ $x_i^2$ - $n*xbar^2$ )/(n-1)) = $\sqrt{}$ (0.20^2 + 0.73^2 + 0.99^2 +1.29^2 + 2.84^2 + 3.34^2 + 4.07^2 + 4.69^2 + 4.86^2 + 6.53^2 + 7.45^2 + 8.07^2 + 8.21^2 + 12.39^2 + 31.67 ^2+ 32.53^2 + 33.92^2 + 36.00^2 +72.72^2-19*14.3421^2)/(19-1)) = 18.7920

3 0

3 years ago

A student is trying to calculate the density of a ball. She already knows the mass, but she needs to determine the volume as wel

mario62 [17]

<h2>Answer and Explanation:</h2><h2 />

The density of a substance is defined as its mass per unit volume. In a mathematical language, this can be written as follows:

$\rho=\frac{m}{V} \\ \\ \\ Where: \\ \\ \rho: \ density \\ \\ m:mass \\ \\ V:Volume$

From the problem, a student is trying to calculate the density of a ball. She already knows the mass, but is facing a problem because she also needs to find the volume. From geometry, we know that the volume of a sphere is:

$V=\frac{4}{3} \pi r^{3}$

Since a ball is a sphere, then the student can use this formula. She just need to measure the radius of the ball and compute the Volumen, then she have to plug both the value of the mass and the value of the Volume in the equation $\rho=\frac{m}{V}$ . An easy way to find the radius is to take the measure of the diameter of the ball and divide that value by 2.

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3 years ago