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Tju [1.3M]
3 years ago
10

(i) Challenge: Thembi received 8% discount on an item which cost

Mathematics
1 answer:
Paul [167]3 years ago
8 0

Answer:

x = 0.25

Step-by-step explanation:

Given

Cost\ Price = 6 + x

Discount =8\%

Amount\ Paid = R6 - x

Required

Find x

First, we calculate the amount paid in terms of the cost price.

This is calculated using:

Amount\ Paid = Cost\ Price * (100\% - Discount)

Amount\ Paid = (6 + x) * (100\% - 8\%)

Amount\ Paid = (6 + x) * 92\%

Express as decimal

Amount\ Paid = (6 + x) * 0.92

Open bracket

Amount\ Paid = 5.52 + 0.92x

So, we have:

Amount\ Paid = 5.52 + 0.92x and

Amount\ Paid = R6 - x ---- given

Equate both

6 - x = 5.52 + 0.92x

Collect like terms

- x -0.92x= 5.52-6

-1.92x= -0.48

1.92x= 0.48

Solve for x

x = \frac{0.48}{1.92}

x = 0.25

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The five interior angles in a  pentagon are in the ratio 2:3:4:5:6. What is the measure of the pentagon's largest angle?
zmey [24]
Let All angles be x times multiplied to ratio , so we"ll get :-

2x + 3x + 4x + 5x + 6x = 540°

20x = 540

x = 540/20

⇒ x = 27 ,

so angles are :-

⇒ 2x = 2×27 = 54°

⇒ 3x = 3×27 = 81°

⇒ 4x = 4×27 = 108°

⇒ 5x = 5×27 = 135°

⇒ 6x = 6×27 = 162°

Hence 162° is the greatest angle
5 0
3 years ago
Graph the piecewise function.<br><br> f(x) = 3⌊x⌋ − 1<br><br> A , B, C, D?
OLga [1]

Answer:

Answer choice A

Step-by-step explanation:

Choice A is the only option that correctly represents the B part of the equation (-1) and has a positive slope of 3.

8 0
3 years ago
A turtle and a rabbit engage in a footrace over a distance of 4.00 km. The rabbit runs 0.500 km and then stops for a 90.0-min na
Oxana [17]

Answer:

(a) 2.29 km/h

(b) 9 km/h

Step-by-step explanation:

For part (a) you have to apply<em> the average speed formula</em>, which is defined by:

v=\frac{d}{t}

where d is the total distance traveled and t is the total time needed.

d=\frac{4.00}{1.75}=2.29 km/h

For part (b) you have to calculate the running time (T) , which is the total time of the race minus the nap time:

The nap time in hours is:

90/60 = 1.5 h (because there are 60 minutes in one hour)

The running time is:

T= 1.75 - 1.5 = 0.25 h

Let t1 represent the time before the nap and t2 the time after the nap:

t1+t2 = T

t1+t2 = 0.25

You have to apply the formula d=vt before and after the nap:

-Before the nap, the distance traveled was 0.50 km

0.50 = v1t1

-Afer the nap, the distance traveled was 3.50 km

3.50=v2t2

But v2=2v1 (because after the nap the rabbit runs twice as fast)

You have to solve the system of equations:

t1=0.25-t2 (I)

v1t1=0.50 (II)

2v1t2=3.50 (III)

Replacing (I) in (II)

v1(0.25-t2)=0.50

Applying distributive property and solving:

0.25v1-v1t2=.050

For (III) you have that v1t2=3.50/2=1.75. Hence:

0.25v1-1.75=0.50

Solving for v1:

v1 = 9 km/h

7 0
3 years ago
What is z if -1/3+2z=-5/6?
Wittaler [7]
-1/3+2z=-5/6
-2/6+2z=-5/6
Add 2/6 to both sides:
2z=-3/6
2z=-1/2
Divide both sides by 2
z=-1/4

Hope this helps :)
7 0
3 years ago
Imagine a population of birds with an initial size of 100, a per-capita birth rate of 2, and a per-capita death rate of 1 per ye
Soloha48 [4]

Answer:

3200

Step-by-step explanation:

Given that:

The initial population of birds N_0 = 100

The time duration t = 5 years

Growth rate (r) = (Birth - Death) rate

= 2 - 1

= 1 / year

∴

using the discrete-time form:

N_t = N_o (1 + r )^t

N_t = 100 (1 + 1 )^5

N_t = 100 (2 )^5

N_t = 100 \times 32

N_t = 3200

8 0
2 years ago
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