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ruslelena [56]
3 years ago
9

Brenda's train leaves at 7:30 a.m. she needs to arrive 10 minutes early to but her ticket. It takes her 20 minutes to get to the

train station. At what time should Brenda leave her house?
Mathematics
2 answers:
IceJOKER [234]3 years ago
7 0
She needs to arrive 10 minutes before the train departs, at 7:30 am, so she 30minutes- 10minutes= 20 minutes
She must arrive by 7:20 am
She also has a 20 minute drive
20minutes-20minutes=0 minutes
She must leave by 7:00 am to make it in time
Lynna [10]3 years ago
5 0
Anytime before 7 will do. But the answer is 7
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What is the sum of the arithmetic sequence 3, 9, 15…, If there are 34 terms?
snow_tiger [21]

Answer:

first we find the common difference.....do this by subtracting the first term from the second term. (9 - 3 = 6)...so basically, ur adding 6 to every number to find the next number.

we will be using 2 formulas....first, we need to find the 34th term (because we need this term for the sum formula)

an = a1 + (n-1) * d

n = the term we want to find = 34

a1 = first term = 3

d = common difference = 6

now we sub

a34 = 3 + (34-1) * 6

a34 = 3 + (33 * 6)

a34 = 3 + 198

a34 = 201

now we use the sum formula

Sn = (n (a1 + an)) / 2

S34 = (34(3 + 201))/2

s34 = (34(204)) / 2

s34 = 6936/2

s34 = 3468 <=== the sum of the first 34 terms:

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3 years ago
Find the equation of the straight line through (–2, 3) perpendicular<br> to 2x + y =8
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Answer:

y = \dfrac{1}{2}x + 4

Step-by-step explanation:

The equation of a line in slope-intercept form is

y = mx + b

We need to find the slope, m, and the y-intercept, b.

The line we need is perpendicular to the line 2x + y = 8.

<em>The slopes of perpendicular lines are negative reciprocals.</em>

We solve the given equation for y to find the slope of the given line.

2x + y = 8

y = -2x + 8

The given line has slope -2.

The negative reciprocal of -2 is 1/2.

Our line has slope, m = 1/2.

Now we have

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Now we use the given point, (-2, 3), for x and y, using x = -2, and y = 3, and we solve for b.

y = 1/2 x + b

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y = 1/2 x + 4

Answer: y = \dfrac{1}{2}x + 4

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Answer:

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1.25x + 1000 = 3000

Subtract 1000 from both sides

1.25x = 2000

Divide both sides by 1.25

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