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4 years ago

Which expressions are equivalent to -3 times 4/-5?

1 answer:

8 0

Hi, I commented on your previous question but never got a response :(

-3 times 4 divided by -5 = -3x-4 is 12, 12/-5 is -2.4
-3 times -4/5 is 12, 12/5 is 2.4

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A local theme park found that if the price of admission was $12 per person, the attendance for the week was 2200. When the price

dolphi86 [110]

You have two points

(12,2200) and (10,3000) You have enough information to set up an equation.

x1 = 12

x2 = 10

y1 = 2200

y2 = 3000

The slope = (y2 - y1)/ (x2 - x1)

The slope = (3000 - 2200) / (10 - 12)

Slope = 800 / - 2

slope = - 400

So far what you have is y = - 400x + b

To get b just use one of the points.

(10,3000)

y = - 400x + b

3000 = -400*10 + b

3000 = - 4000 + b Add 4000 to both sides.

3000 + 4000 = b

b = 7000

Answer y = - 400x + 7000

What happens if you use (12,2200)

y = -400*12+ 7000

y = - 4800 + 7000

y = 2200 As it should.

3 0

4 years ago

A lorry is travelling at 13.5 m/s along a stretch of road where the speed limit is 50km/h. Show the lorry is travelling below th

Juli2301 [7.4K]

Answer:

50 km/hr >48.6 km/hr the speed of lorry is less that speed limit.

Step-by-step explanation:

Given : A lorry is travelling at 13.5 m/s along a stretch of road where the speed limit is 50 km/h.

To find : Show the lorry is travelling below the speed limit ?

Solution :

The speed limit is 50 km/h.

A lorry is travelling at 13.5 m/s along a stretch of road.

We have to convert m/s into km/hr,

$\frac{km}{hr}=\frac{1000\ m}{60\times 60\ s}$

$\frac{km}{hr}=\frac{5}{18}\frac{m}{s}$

$\frac{m}{s}=\frac{18}{5}\frac{km}{hr}$

Multiply the given number by 18/5,

$13.5\frac{m}{s}=\frac{18}{5}\times 13.5 \frac{km}{hr}$

$13.5\frac{m}{s}=48.6\frac{km}{hr}$

So, A lorry is travelling at 48.6 km/hr along a stretch of road.

As, 50 km/hr >48.6 km/hr the speed of lorry is less that speed limit.

Therefore, The lorry is travelling below the speed limit.

5 0

3 years ago

For ΔABC, ∠A = 4x + 7, ∠B = 2x + 3, and ∠C = 6x - 10. If ΔABC undergoes a dilation by a scale factor of 2 to create ΔA'B'C' with

blsea [12.9K]

Bizzare problem. What are the choices?

The triangle angles add to 180.

4x + 7 + 2x +3 + 6x - 10 = 180

12x = 180

x = 15

Dilation doesn't change the angles so we must have

4x + 7 = 5x - 8 and 2x + 3 = 3x - 12 and 6x - 10 = 7x - 25

Fortunately x=15 is the solution to all of these so it's consistent.

3 0

3 years ago

Read 2 more answers

-5x+13y=-7 what does y equal?

mart [117]

Here you go I hope this right hope it help

5 0

4 years ago

Read 2 more answers

SOMEONE HELP MEEEEEE

il63 [147K]

Answer:

Part 1) $9x-7y=-25$

Part 2) $2x-y=2$

Part 3) $x+8y=22$

Part 4) $x+8y=35$

Part 5) $3x-4y=2$

Part 6) $10x+6y=39$

Part 7) $x-5y=-6$

Part 8)

case A) The equation of the diagonal AC is $x+y=0$

case B) The equation of the diagonal BD is $x-y=0$

Step-by-step explanation:

The complete answer in the attached file

Download docx

5 0

4 years ago