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3 years ago

11

I need some help 7th grade math

1 answer:

katrin2010 [14]3 years ago

8 0

Answer:

Whats the math problem??

Step-by-step explanation:

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Find the values of f(x) = 8x²-1 for the domain values {-2,5} (input answers from least to greatest}

Whitepunk [10]

Answer:

So i just used the calculator to help me find the two co exisiting lines and then worked my way up to find the nearest decimal to fit the equation for the missing parablar length which was parallel to find the cointerior angle which lead me to get a decimal number involving an ordinary form number.

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2 years ago

Lindsay has some yellow and red flowers in a vase. The ratio of yellow to red flowers is 4 : 7. The number of yellow flowers in

Naddik [55]

14 red flowers so d because it says 4:7 so there is 8 yellow and 14 red so so fine the lowest common multiple thin divide both by same LCM and git your answer <span />

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3 years ago

Read 2 more answers

2. The Welcher Adult Intelligence Test Scale is composed of a number of subtests. On one subtest, the raw scores have a mean of

IgorC [24]

Answer:

a) 37.31 b) 42.70 c) 0.57 d) 0.09

Step-by-step explaanation:

We are regarding a normal distribution with a mean of 35 and a standard deviation of 6, i.e., $\mu$ = 35 and $\sigma$ = 6. We know that the probability density function for a normal distribution with a mean of $\mu$ and a standard deviation of $\sigma$ is given by

$f(x) = \frac{1}{\sqrt{2\pi}\sigma}\exp[-\frac{(x-\mu)^{2}}{2\sigma^{2}}]$

in this case we have

$f(x) = \frac{1}{\sqrt{2\pi}6}\exp[-\frac{(x-35)^{2}}{2(6^{2})}]$

Let $X$ be the random variable that represents a row score, we find the values we are seeking in the following way

a) we are looking for a number $x_{0}$ such that

$P(X\leq x_{0})$ = $\int\limits^{x_{0}}_{-\infty} {f(x)} \, dx = 0.65$ , this number is $x_{0}$ =37.31

you can find this answer using the R statistical programming languange and the instruction qnorm(0.65, mean = 35, sd = 6)

b) we are looking for a number $x_{1}$ such that

$P(X\leq x_{1})$ = $\int\limits^{x_{1}}_{-\infty} {f(x)} \, dx = 0.9$ , this number is $x_{1}$ =42.70

you can find this answer using the R statistical programming languange and the instruction qnorm(0.9, mean = 35, sd = 6)

c) we find this probability as

$P(28\leq X\leq 38)$ = $\int\limits^{38}_{28} {f(x)} \, dx = 0.57$

you can find this answer using the R statistical programming languange and the instruction pnorm(38, mean = 35, sd = 6) -pnorm(28, mean = 35, sd = 6)

d) we find this probability as

$P(41\leq X\leq 44)$ = $\int\limits^{44}_{41} {f(x)} \, dx = 0.09$

you can find this answer using the R statistical programming languange and the instruction pnorm(44, mean = 35, sd = 6) -pnorm(41, mean = 35, sd = 6)

6 0

3 years ago

Read 2 more answers

A die is rolled two separate times. What is the probability that the first roll

Masteriza [31]

1/6 times 1/2 is D. 1/12

4 0

2 years ago

A bicycle rental company charges $10 for a bicycle rental, plus an additional $2.25 per hour that the bicycle is rented. The tot

kondaur [170]

Answer:

7 hours

Step-by-step explanation:

25.75(total cost of the rental)

-10.00 (cost of initially renting the bike)

----------------

15.75$ (cost of hourly fees)

15.75/2.25(hourly rate) = 7

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2 years ago