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Korvikt [17]
3 years ago
11

a 23 centimeter piece of rope is cut into two pieces. If one piece is z centimeter's long, express the other length as an algebr

aic expression in z
Mathematics
1 answer:
olga2289 [7]3 years ago
6 0

Answer:

23 - z

Step-by-step explanation:

Given

Length =23cm

One\ Piece = z

Required

Derive an expression for the second piece

Represent the second piece with x,

So, we have:

x + z = 23cm

x + z = 23

Subtract z from both sides

x + z - z = 23 -z

x = 23 -z

Hence:

An expression for the second piece is 23 - z

You might be interested in
25m + 100 - 24m - 75 = 68.
Maksim231197 [3]

25m+100−24m−75=68

Step 1: Simplify both sides of the equation.

25m+100−24m−75=68

25m+100+−24m+−75=68

(25m+−24m)+(100+−75)=68(Combine Like Terms)

m+25=68

m+25=68

Step 2: Subtract 25 from both sides.

m+25−25=68−25

m=43

Answer:

m=43

8 0
3 years ago
The table below shows the functions to represent the sale f(t), in thousands, of four companies in t years: Company A B C D Sale
bazaltina [42]

1) Company A and C

2)Your answer is f(t) = 180(0.5)^t This is because the number is cut in half for every hour.

3)C 0 ≤ x ≤ 50 is the right answer because the starting time 9:05 is considered as zero and the 9:55 is the ending point which is considered as 50.Or simply the difference of both the times is the domain of the function.



5 0
3 years ago
How do you write an equation for (-5,-1), (0,-1)
lesya692 [45]
Both the points have a coordinate where y is -1, so the equation is simply -1

y=-1

however if you wanted to really show the working out, it looks like this:

y=mx+c

m=change in y/change in x

m=(-1-1)/(-5+0)=0

subsitute one of the coordinates into y=mx+c

-1=0+c

c=-1

so then y=-1



4 0
3 years ago
when a pen is sold at a discount of 15%, there is a gain of Rs 10. but if it is sold at 25% discount, there is a loss of Rs 2. f
LenaWriter [7]

Answer:

Rs 120.  

Step-by-step explanation:

10=0.85SP-CP; CP+10=0.85SP; SP=[CP+10]/0.85 Eq 1. Let SP= Selling Price and CP= Cost Price

-2 =0.75SP-CP; 0.75SP=C-2; SP=[CP-2]/0.75 Eq 2

[CP+10]/0.85=[CP-2]/0.75 : SP of Eq 1=SP of Eq 2

0.75[CP+10]=0.85[CP-2]

0.75CP+7.5=0.85CP-1.7

0.85CP-0.75CP=-1.7–7.5=9.2

0.10CP=9.2; CP=9.2/0.10

CP=Rs 92 Cost Price of pen

10=0.85SP-92; 0.85SP=92+10=102; SP=102/0.85=Rs 120 Marked Price of pen (answer)

From Eq2: -2=0.75SP-CP; 0.75SP=CP-2=92–2=90; SP=90/0.75=Rs120; -2=0.75(120)-CP; CP-2=0.75(120); CP-2=90; CP=90+2=Rs 92

Set CP of Eq 1=CP of Eq 2:

CP=0.85SP-10 from Eq 1; CP=0.75SP+2 from Eq 2;

0.85SP-10=0.75SP+2; 0.85SP-0.75SP=10+2=12

0.10SP=12; SP=12/0.10=Rs120 is the Marked Price(answer)

Normally, the Selling Price is the marked price. The seller will not disclose the Cost Price because it is the price when the item was acquired or procured, otherwise the buyer will ask for more discounts and based his buying price from the Cost Price if it is known. The calculated SP and CP satisfy both Eq 1 and Eq 2. Both Eq 1 and Eq 2 satisfy the given conditions of the problem above.

8 0
3 years ago
Valerie is remodeling her home. She decides to replace the old carpet in the living room and wants to know how much carpet she n
PIT_PIT [208]

Answer:

It can be decomposed into the following simplest shapes:

Two Rectangles and one Triangle.

The area is 242\ ft^2

Step-by-step explanation:

You can observe in the picture attached that it can be decomposed into the following simplest shapes:

Two Rectangles.

One Triangle.

The area of the a rectangle can be found with:

A=lw

Where "l" is the length and "w" is the width.

You can identify in the picture that:

l_A=14\ ft\\w_A=13\ ft-7\ ft=6\ ft\\\\l_B=20\ ft\\w_B=7\ ft

Substituing values, you get that the areas of the rectangles A and B are:

A_A=(14\ ft)(6\ ft)=84\ ft^2\\\\\\A_B=(20\ ft)(7\ ft)=140\ ft^2

The formula for the area of a triangle is:

A=\frac{bh}{2}

Where "b" is the base and "h" is the height.

In this case:

b=20\ ft-14\ ft=6\ ft\\\\h=6\ ft

Then, its area is:

A_C=\frac{(6\ ft)(6\ ft)}{2}= 18\ ft^2

Then, the total area of carpet that Valerie needs for her project is:

A_t=A_A+A_B+A_C\\\\A_T=84\ ft^2+140\ ft^2+18\ ft^2\\\\AT=242\ ft^2

7 0
3 years ago
Read 2 more answers
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