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larisa86 [58]
3 years ago
13

Hi there can you please help ​

Mathematics
1 answer:
Alexeev081 [22]3 years ago
7 0
1st one is -64
2nd one is also -64
3rd one is just 64
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5(5z - 7), when z = -1
Alchen [17]

Answer:

5(5(-1)-7)

-25-35

-60

Step-by-step explanation:

4 0
3 years ago
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1. If you wish to calculate the interest on an investment with an interest rate
maksim [4K]
<h3>Answer:  Choice D)  0.0285</h3>

=========================================

Explanation:

You move the decimal point two spots to the left to go from 2.85% to 0.0285

Or you can think of it like this:

2.85% = (2.85)/100 = 0.0285

since "percent" means "per 100"

8 0
3 years ago
The Volume of a sphare is 28/3 times the surface area calculate The surface area and the Volume of the sphere, correct to the ne
Aloiza [94]

Given:

Volume of a sphere is \dfrac{28}{3} times the surface area.

To find:

The surface area and the volume of the sphere.

Solution:

Volume of a sphere:

V=\dfrac{4}{3}\pi r^3              ...(i)

Surface area of a sphere:

A=4\pi r^2                      ...(ii)

Where, r is the radius of the sphere.

Volume of a sphere is \dfrac{28}{3} times the surface area.

V=\dfrac{28}{3}\times A

\dfrac{4}{3}\pi r^3=\dfrac{28}{3}\times 4\pi r^2

Multiply both sides by 3.

4\pi r^3=112\pi r^2

\dfrac{\pi r^3}{\pi r^2}=\dfrac{112}{4}

r=28

Using (i), the volume of the sphere is:

V=\dfrac{4}{3}\times \dfrac{22}{7}\times (28)^3

V\approx 91989

Using (ii), the surface area of the sphere is:

A=4\times \dfrac{22}{7}\times (28)^2

A=9856

Therefore, the surface area of the sphere is 9856 sq. units and the volume of the sphere is 91989 cubic units.

3 0
3 years ago
What is the area of a regular octagon with a side length of 4.6 meters and a length from the center to a vertex of 6 meters? HEL
Shtirlitz [24]

<span>What is the area of a regular octagon with a side length of 4.6 meters and a length from the center to a vertex of 6 meters? 

Good Morning
 
The Correct Answer is c) 101.2

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6 0
3 years ago
Thomas received a $50 gift card for an online store, and he wants to buy LED lights to decorate his bedroom. If one strand
olga nikolaevna [1]

Answer:

Thomas can buy 4 strands.

Step-by-step explanation:

We need to round $11.86 to the nearest dollar, which is $12.

Now we ask ourselves, "how many times does 12 go into 50 without going over?"

12 × 4 = 48

12 can go into 50 4 times.

8 0
3 years ago
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