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Tcecarenko [31]
3 years ago
8

Please help me solve this i have no idea

Mathematics
1 answer:
zloy xaker [14]3 years ago
3 0

Simplify both sides of the equation

3(x-4)+12(x-9)=4x+13

Distribute

(3)(x)+(3)(-4)+(12)(x)+(12)(-9)=4x+13

3x+-12+12x+-108=4x+13

Combine like terms

15x+-120=4x+13

15x-120=4x+13

Subtract 4 from both sides

15x-120-4x=4x+13-4x

11x-120=13

Add 120 to both sides

11x-120+120=13+120

11x=133

Divide both sides by 11

11x/11=133/11

x=133/11

or x= 12 1/11


I hope that's help !

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Answer:

Her average speed from Ashdown to Carton is approximately 48.4 mph

Step-by-step explanation:

The time and speed of the motion of Priti are as follows;

The time it takes Priti to drive from Ashdown to Bridgeton, t₁ = 4 hours

The average speed she drove from Ashdown to Bridgeton = 50 mph

The distance she drove from Bridgeton to Carton, d₂ = 30 miles

Her average speed from Bridgeton to Carton = 40 mph

The distance from Ashdown to Bridgeton, d₁ = 50 mph × 4 hours = 200 miles

The time it takes Priti to drive from Bridgeton to Carton, t₂ = 30 miles/(40 mph) = 0.75 hour

Average velocity, v_{ave} = (Total distance traveled, Δd)/(Total time, Δt)

Δd = d₁ + d₂, Δt = t₁ + t₂

Δd = 200 miles + 30 miles = 230 miles

Δt = 4 hours + 0.75 hour = 4.75 hours

∴ The average velocity, v_{ave} = (230 miles)/(4.75 hours)

∴ v_{ave} = (920/19) mph

Her average speed from Ashdown to Carton, rouded to 1 d,p, v_{ave} ≈ 48.4 mph

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