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3 years ago

Evaluate -7a – 2b, if a = -1 and b = 2.

Mathematics

2 answers:

Novay_Z [31]3 years ago

7 0

Plug in a and be into the equations:

- 7( - 1) - 2(2) = \\ 7 - 4 = \\ 3

Roman55 [17]3 years ago

5 0

Plug in a and be into the equations:
$- 7( - 1) - 2(2) = \\ 7 - 4 = \\ 3$

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What is 2 + 2, minus 4?

Archy [21]

Answer:

Step-by-step explanation:

2 + 2 = 4 and then 4 - 4 = 0

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3 years ago

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Item 16 A sphere has a radius of 8 centimeters. A second sphere has a radius of 2 centimeters. What is the difference of the vol

Zigmanuir [339]

Answer:

$672\pi \text{ cm}^3$ .

Step-by-step explanation:

We have been given that a sphere has a radius of 8 centimeters. A second sphere has a radius of 2 centimeters. We are asked to find the difference of the volumes of the spheres.

We will use volume formula of sphere to solve our given problem.

$\text{Volume of sphere}=\frac{4}{3}\pi r^3$ , where r is radius of sphere.

The difference of volumes would be volume of larger sphere minus volume of smaller sphere.

$\text{Difference of volumes}=\frac{4}{3}\pi(\text{8 cm})^3-\frac{4}{3}\pi(\text{2 cm})^3$

$\text{Difference of volumes}=\frac{4}{3}\pi(512)\text{ cm}^3-\frac{4}{3}\pi(8)\text{ cm}^3$

$\text{Difference of volumes}=\frac{4}{3}\pi(512-8)\text{ cm}^3$

$\text{Difference of volumes}=4\pi(168)\text{ cm}^3$

$\text{Difference of volumes}=672\pi\text{ cm}^3$

Therefore, the difference between volumes of the spheres is $672\pi \text{ cm}^3$ .

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3 years ago

The distance between two subway stations is 3 miles. If a train

dolphi86 [110]

Answer: 3

Step-by-step explanation:

Divide every mile is one minute

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3 years ago

A group of people want to buy tickets to a baseball game. At least 18 people need to buy tickets in order to get the group rate.

borishaifa [10]

Answer:

a or b

Step-by-step explanation:

it should be p≥18

greater then or equal to 18. because if you have 18, you can get the group rate and I'd you have more than 18 you can also get the group rate.

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3 years ago

3)June 2019-In the diagram below of AABC, D is a

Alexeev081 [22]

Answer:

BC = 23.8

Step-by-step explanation:

See the diagram attached.

Given AC ║ DE and BD = 5, DA = 12 and BE = 7.

We have to find BC.

Since, AC ║ DE, so, Δ ABC and Δ DBE are similar.

If two triangles are similar then the ratio of their corresponding sides remains the same.

Hence, $\frac{BD}{BA} = \frac{BE}{BC}$

⇒ $\frac{5}{12 + 5} = \frac{7}{BC}$

⇒ $BC = \frac{7 \times 17}{5} = 23.8$ (Answer)

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3 years ago