3 years ago

3(0.7z+2.8)=7(1.5z+7.2)

Mathematics

1 answer:

AnnZ [28]3 years ago

7 0

Answer:

z = -5

Step-by-step explanation:

3(0.7z + 2.8) = 7(1.5z + 7.2)

2.1z + 8.4 = 10.5z + 50.4

2.1z - 10.5z = 50.4 - 8.4

-8.4z = 42

z = 42/(-8.4)

z = -5

You might be interested in

Please answer below :)

Luden [163]

Answer:(x+2)(x+8)

Step-by-step explanation:

6 0

3 years ago

Micah sketches the graph below to represent a scenario his teacher gave him.

Sophie [7]

.Step-by-step explanation:

5 0

3 years ago

Read 2 more answers

On a map ,1cm represents 30 miles. Find the actual distance between two cities if they are 5.2 cm apart on the map.

Vesna [10]

Multiply 5.2 x 30 and you get 156 miles

6 0

3 years ago

4000 dollars is placed in an account with an annual interest rate of 5.25%. How much will be in the account after 17 years, to t

dezoksy [38]

5.25% of 4000 is 210, multiplied by 17 is 3570, plus the initial 4000 comes to $7570.00

3 0

4 years ago

An octagonal swimming pool has a base area of 22 square feet The pool is 3 feet deep How many cubic feet of water can the pool h

LenKa [72]

The pool can hold 65.84 ft³ of water

<u>Explanation:</u>

Given:

Shape of pool = octagonal

Base area of the pool = 22 ft²

Depth of the pool = 3 feet

Volume, V = ?

We know:

Area of octagon = 2 ( 1 + √2) a²

22 ft² = 2 ( 1 + √2 ) a²

$\frac{11}{1+\sqrt{2} } = a^2$

a² = $\frac{11}{2.42}$

a² = 4.55

a = 2.132 ft

Side length of the octagon is 2.132 ft

We know:

Volume of octagon = $2(1+\sqrt{2} ) X (a)^2 X h$

$V = 2(1+\sqrt{2})X (2.132)^2 X 3\\ \\V = 2 ( 2.414) X 4.5454 X 3\\\\V = 65.84 ft^3$

Therefore, the pool can hold 65.84 ft³ of water

8 0

3 years ago