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3 years ago

Jordan is 12 years older than Anna. The

Mathematics

1 answer:

user100 [1]3 years ago

4 0

9514 1404 393

Answer:

J = [12] +A
J + A = [50]

Step-by-step explanation:

If Anna's age is represented by A, then 12 more than Anna's age will be ...

12 + A

Jason's age is said to be 12 more than Anna's age, so ...

J = 12 + A

The sum of their ages will be J + A. That is said to be 50, so ...

J + A = 50

_____

These equations can be solved by using the first to substitute for J in the second.

(12 +A) +A = 50

2A = 38 . . . . . . . . subtract 12

A = 19 . . . . . . . . . . divide by 2

J = 12 +19 = 31 . . . find Jason's age

Jason is 31; Anna is 19.

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Step-by-step explanation:

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3 years ago

The projectile motion of an object can be modeled using s(t)=gt^2+v0t+s0, where g is the acceleration due to gravity, t is the t

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Answer:

S(t) = -4.9t^2 + Vot + 282.24

Step-by-step explanation:

Since the rocket is launched from the ground, So = 0 and S(t) = 0

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Where g acceleration due to gravity = -4.9m/s^2. and

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3 years ago

Read 2 more answers

A set of test scores is normally distributed with a mean of 130 and a standard deviation of 30 What score is necessary to reach

nlexa [21]

Answer:

A score of 150.25 is necessary to reach the 75th percentile.

Step-by-step explanation:

Problems of normal distributions can be solved using the z-score formula.

In a set with mean $\mu$ and standard deviation $\sigma$ , the zscore of a measure X is given by:

$Z = \frac{X - \mu}{\sigma}$

The Z-score measures how many standard deviations the measure is from the mean. After finding the Z-score, we look at the z-score table and find the p-value associated with this z-score. This p-value is the probability that the value of the measure is smaller than X, that is, the percentile of X. Subtracting 1 by the pvalue, we get the probability that the value of the measure is greater than X.

A set of test scores is normally distributed with a mean of 130 and a standard deviation of 30.

This means that $\mu = 130, \sigma = 30$