3 years ago

Which equation is an identity?

1 answer:

3 0

7z + 10 - z = 8z - 2(z - 5)
7z + 10 - z = 8z - 2z + 10
6z + 10 = 6z + 10
6z - 6z = 10 - 10
0 = 0

Therefore, 7z + 10 - z = 8z - 2(z - 5)

You might be interested in

A rectangular box with a square base is to be constructed from material that costs $9 per ft2 for the bottom, $4 per ft2 for the

mafiozo [28]

Answer:

V = 23.85 ft³

Step-by-step explanation:

The dimension of the square base = x ft by x ft

Height of box = y

Volume of the box, $V = x^{2} y$

Cost of top = $4 * $x^{2}$

Cost of the bottom = $9 * $x^{2}$

Cost of the sides = $3 * 4xy

Total cost = 4x² + 9x² + 12xy

Total cost = 13x² + 12xy

Total cost = $193

193 = 13x² + 12xy

$y = \frac{193 - 13x^{2} }{12x}$

But volume, V = x²y

V = $\frac{x^{2} (193 - 13x^{2}) }{12x}$

V = $\frac{x (193 - 13x^{2}) }{12}$ ...................(1)

At maximum value, V' = 0

0 = $\frac{193 - 39x^{2} }{12}$

$39x^{2} = 193\\x^{2} = \frac{193}{39}$

x = 2.23

Put the value of x into (1)

$V = \frac{2.23 (193 - 13*2.23^{2}) }{12}$

V = 23.85 ft³

6 0

3 years ago

Suppose you have just inherited a sum of money. Let’s say you choose to invest the money. How much did you inherit? Choose an am

VladimirAG [237]

Answer:

What is your interest rate?

Step-by-step explanation:

6 0

2 years ago

What is the answer for this. <br>simplify -6 ÷ 3

____ [38]

Answer:

-2

Step-by-step explanation:

When you divide negative 6 by 3, it stays a negative. So, it's like dividing 6 by three then putting a negative sign on it.

6 0

3 years ago

How many ways can you count to ten?

ryzh [129]

You could count by 2 or by adding 5+5 or 5x2 but I think there is more than what I added

3 0

3 years ago

Read 2 more answers

An apple is cut into 6 equal slices. Nancy eats 2 of the slices. What fraction of the apple is left?

Ede4ka [16]

Answer:

Fraction of apple pieces left = 4/6 = 2/3

5 0

2 years ago

Read 2 more answers