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3 years ago

Marissa subtracted a negative number from a positive number. Her result was negative. Is that reasonable

Mathematics

1 answer:

NISA [10]3 years ago

5 0

Answer:

No.

Step-by-step explanation:

If Marissa subtracts a negative number, it would be like - -x, which is x. So, her result would be positive.

Hope this helps!

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What is 7 2/10 as a decimal

Dmitry_Shevchenko [17]

When changing fractions into decimals the whole number goes before the period and the fraction goes after.The denominator of the fraction will tell you whether or not you need to put any zeros before the numerator. If the denominator is 10 zeros are not needed.The end result is 7.2 and can be read as seven tenths.

6 0

4 years ago

Read 2 more answers

a cylindrical can of soup has a height of 4 inches and a radius of 3 inches. what is the volume of the can? round your answer to

grandymaker [24]

The equation for volume is V= (pi)(R^2)xH
For Pi use 3.14
So switch the variables for the numbers that we know
V= (3.14)(3^2)x4
3^2= 9
3.14 x 9= 28.26
28.26x9 = 113.04
113.04 to the nearest tenth would be 113.

5 0

3 years ago

In the figure above, PQRS is a circle. If PQT and SRT<br>are straight lines, find the value of x.

Elena L [17]

Given:

PQRS is a circle, PQT and SRT are straight lines.

To find:

The value of x.

Solution:

Since PQRS is a circle, PQT and SRT are straight lines, therefore, PQRS isa cyclic quadrilateral.

We know that, sum of opposite angles of a cyclic quadrilateral is 180 degrees.

$m\angle SPQ+m\angle QRS=180^\circ$

$81^\circ+m\angle QRS=180^\circ$

$m\angle QRS=180^\circ-81^\circ$

$m\angle QRS=99^\circ$

Now, SRT is a straight line.

$m\angle QRT+m\angle QRS=180^\circ$ (Linear pair)

$m\angle QRT+99^\circ=180^\circ$

$m\angle QRT=180^\circ-99^\circ$

$m\angle QRT=81^\circ$ ...(i)

According to the Exterior angle theorem, in a triangle the measure of an exterior angle is equal the sum of the opposite interior angles.

Using exterior angle theorem in triangle QRT, we get

$m\angle PQR=m\angle QRT+m\angle QTR$

$x=81^\circ+22^\circ$

$x=103^\circ$

Therefore, the value of x is 103 degrees.

4 0

3 years ago

At the local ballpark, the team charges $5 for each ticket and expects to make $1,500 in consessions. The team must pay its play

Elan Coil [88]

Answer:

B - 1100 tickets

Step-by-step explanation:

Fixed costs appear to be ...

$2,200 +1,500 = $3,700

The amount of cost that is not covered by concession income is ...

$3,700 -1500 = $2,200 . . . . remaining cost

The contribution margin per ticket is apparently ...

$5 -3 = $2

So, the number of tickets that must be sold to cover the remaining cost is ...

$2200/($2/ticket) = 1100 tickets

5 0

3 years ago

Read 2 more answers

Using diaries for many weeks, a study on the lifestyles of visually impaired students was conducted. The students kept track of

Hoochie [10]

Answer:

a) 0.1020

b) 0.7125

c) 7.64 hours

Step-by-step explanation:

Problems of normally distributed samples 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.

In this problem, we have that:

$\mu = 8.65, \sigma = 1.93$

(a) What is the probability that a visually impaired student gets less than 6.2 hours of sleep?

This is the pvalue of Z when X = 6.2. So

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

$Z = \frac{6.2 - 8.65}{1.93}$

$Z = -1.27$

$Z = -1.27$ has a pvalue of 0.1020.

So the answer for a is 0.1020.

(b) What is the probability that a visually impaired student gets between 6.8 and 10.93 hours of sleep?

This is the pvalue of Z when X = 10.93 subtracted by the pvalue of Z when X = 6.8. So

X = 10.93

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

$Z = \frac{10.93 - 8.65}{1.93}$

$Z = 1.18$

$Z = 1.18$ has a pvalue of 0.8810.

X = 6.8

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

$Z = \frac{6.8 - 8.65}{1.93}$

$Z = -0.96$

$Z = -0.96$ has a pvalue of 0.1685.

So the answer for b) is 0.8810 - 0.1685 = 0.7125.

(c) Thirty percent of students get less than how many hours of sleep on a typical day?

This is the value of X in the 30th percentile, that is, the value of X when Z has a pvalue of 0.30. So it is X when Z = -0.525, since this happens between Z = -0.53 and Z = -0.52.

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

$-0.525 = \frac{X - 8.65}{1.93}$

$X - 8.65 = -0.525*1.93$

$X = 7.64$

The answer for c is 7.64 hours.

3 0

3 years ago