Find the sum 3a/bc + 2b/ac
1 answer:
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Let's say, the first number is "n"
well, the consecutive number of "n" is "n + 1"and the consecutive number of "n+1" is "n + 1" +1 or n + 2
so, the numbers are (n), (n+1) and (n+2), whatever "n" is
now, the sum of their squares is 116
expand the binomials by FOIL or binomial theorem, and then simplify
well, the consecutive number of "n" is "n + 1"and the consecutive number of "n+1" is "n + 1" +1 or n + 2
so, the numbers are (n), (n+1) and (n+2), whatever "n" is
now, the sum of their squares is 116
expand the binomials by FOIL or binomial theorem, and then simplify
Answer:
1. b.(03)
2. A.(6,12)
3. C.(10,-1)
4. (-9,2)
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Step-by-step explanation:
1.I will solve your system by substitution.
−x+2y=6;6y=x+18
Step: Solve−x+2y=6for x:
−x+2y+−2y=6+−2y(Add -2y to both sides)
−x=−2y+6
Divide by -1
x=2y−6\
Well I did this problem differently I substitute
Step: Substitute2y−6for x in6y=x+18:
6y=x+18
6y=2y−6+18
6y=2y+12
6y+−2y=2y+12+−2y
4y=12
y=3
Step: Substitute3 for y in x=2y−6:
x=2y−6
x=(2)(3)−6
x=0
Your final answer will be x=0 and y=3
Answer:
45; 9
Step-by-step explanation:
1) if the rate of the boat in still water is 'b' and the rate of the current is 'c', then it is possible to write the rate of the boat going upstream: b-c, downstream: b+c.
2) the basic formula is: D=r*t, where D - distance, r - rate/velocity, t - time;
3) according to the condition it takes 3 hours to travel 108 km upstream, it means according to the formula above 3(b-c)=108;
4) according to the condition it takes 2 hours to travel 108 km downstream, it means according to the formula above 2(b+c)=108;
5) if to make up the system of two equations, then:
6) rate of the boat in still water: 45 km/h;
rate of the current: 9 km/h.