High school play at least once were. This is 70% of the students at the school how many students are at the school

C+a+b=p solve for C literal equation

solniwko [45]

C+a+b=p

move a to the other side

sign changes from +a to -a

C+a-a+b=p-a

C+b= p-a

move +b to the other side

C+b-b= p-a-b

Answer:

C= p-a-b

5 0

4 years ago

Which is not an equation of the line going through (6,7) and (2,-1) A. y-7=2(x-6) B. y=2x-5 C. y-1=2(x+2) D. y+1=2(x-2)

nikdorinn [45]

Answer:

C. y-1=2(x+2)

Step-by-step explanation:

A. y-7=2(x-6)-point slope form: y-y1=2(x-x1)-coordinate point: (x1,y1)=(6,7)

Now let's check that the other point works-just sub in the coordinates for the x and y variables.

y-7=2(x-6)\\-1-7=2(2-6)\\-8=2(-4)\\-8=-8

So answer choice A. goes through both points, so no.

B. y=2x-5-slope-intercept form, so just sub in both sets of coordinates separately to see if they each work.

y=2x-5\\7=2(6)-5\\7=12-5\\7=7\\equal

y=2x-5\\-1=2(2)-5\\-1=4-5\\-1=-1\\equal

Both work, so no.

C. y-1=2(x+2)-point slope form that gives us first coordinate set--(-2,1)

Except that the point is actually (2,-1) not (-2,1). That means that answer choice C is not an equation of the line thaat goes through (6,7) and (2,-1), so yes.

D. Anyway, if we check D--y+1=2(x-2)--coordinate point given: (2,-1), which is correct, so no.

4 0

3 years ago

Which function in Excel is used to perform a test of independence? a. T.TEST b. CHISQ.TEST c. NORM.S.DIST d. Z.TEST

denis23 [38]

Answer:

b. CHISQ.TEST

Step-by-step explanation:

Notation and previous concepts

A chi-square test is "used to test if the variance of a population is equal to a specified value. This test can be either a two-sided test or a one-sided test. The two-sided version tests against the alternative that the true variance is either less than or greater than the specified value"

The statistic is given by:

$\chi^2 = \sum_{i=1}^n \frac{(O_i-E_i)^2}{E_i}$

In order to calculate the p value we need to have in count the degrees of freedom , on this case $df=(rows-1)(#cols-1)$ . And we can calculate the p value would be given by:

$p_v =P(\chi^2 >\chi^2_{calc})$

But the correct comand is given by:

b. CHISQ.TEST(Actual range, Expected range)

We just need to put in one column the Observed values and in other the expectec values.

3 0

3 years ago

How many positive four-digit integers are multiples of 5 and less than 4,000

Volgvan

Answer:

Number of positive four-digit integers which are multiples of 5 and less than 4,000 = 600

Explanation:

Lowest four digit positive integer = 1000

Highest four digit positive integer less than 4000 = 3999

We know that multiples of 5 end with 0 or 5 in their last digit.

So, lowest four digit positive integer which is a multiple of 5 = 1000

Highest four digit positive integer less than 4000 which is a multiple of 5 = 3995.

So, the numbers goes like,

1000, 1005, 1010 .....................................................3990, 3995

These numbers are in arithmetic progression, so we have first term = 1000 and common difference = 5 and nth term(An) = 3995, we need to find n.

An = a + (n-1)d

3995 = 1000 + (n-1)x 5

(n-1) x 5 = 2995

(n-1) = 599

n = 600

So, number of positive four-digit integers which are multiples of 5 and less than 4,000 = 600

6 0

3 years ago

A car enters an interstate highway 20 mi north of a city. The car travels north at an average speed of 58 mph. Which equation mo

HACTEHA [7]

The answer would be 20 d = h + 58

3 0

3 years ago