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timofeeve [1]
3 years ago
13

PLEASE HELP! I AM HAVING PROBLEM WITH THESE SET OF PROBLEMS!!! IF YOU GET THEM CORRECTLY YOU WILL EARN 15 POINTS!!!

Mathematics
2 answers:
soldier1979 [14.2K]3 years ago
6 0

Answers:

a = 128

∑ = 11

olga nikolaevna [1]3 years ago
3 0
Answers:
a =  128
<span>∑ = 11</span>
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Is the line through points P(2, –5) and Q(–5, –1) parallel to the line through points R(5, 4) and S(–2, 5)? Explain.
Irina-Kira [14]

Answer:

the answer is No

Step-by-step explanation:

Since the first line has a slope of -4/7 and the other line has a slope of -1/7. This can be shown in point slope form y-y1=m(x-x1) where m=∆y/∆x.

Through points P and Q, the point slope is represented as -1-(-5)=m(-5-2) ; 4 = -7m ; m = 4/-7. The next two points R and S can be shown in point slope as 5-4=m(-2-5) ; 1 = -7m ; m =1/-7. With the fact that parallel lines must have equal slopes, these two lines cannot be parallel because -4/7≠-1/7

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3 years ago
The Chang family is on their way home from a cross-country road trip. During the trip, the function D (t) = 3260 - 55t can be us
Lilit [14]

Answer:

See below.

Step-by-step explanation:

D(t) = 3260 - 55t

The function that shows their distance from home as a function of time shows that they started 3260 miles from home and are driving at 55 miles per hour.

part a:

D(12) = 3260  55(12)

D(12) = 3260 - 660

D(12) = 2600

Interpretation: After 12 hours of driving home, they are 2600 miles from home.

part b:

D(t) = 2490

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t = 14

Interpretation: When they are 2490 miles from home, they have driven for 14 hours.

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2 years ago
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B.) would be the answer
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Step-by-step explanation:

because if they work together it will be 9 hours slower than Kelsey's time alone.

not sure if correct

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3 years ago
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