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olya-2409 [2.1K]
3 years ago
11

Evaluate the expression when a=-7. a^2+4a-2

Mathematics
1 answer:
andrey2020 [161]3 years ago
4 0

Plug in the value to solve the expression.

(-7)^2+4(-7)-2

49-28-2

19

Hope this helps.

頑張って!

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Answer:

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3 years ago
A garden is designed in the shape of a rhombus formed from 4 identical 30°-60°-90° triangles. The shorter distance across the mi
EleoNora [17]

Answer:

c) 120 ft

Step-by-step explanation:

Let's consider the rhombus has 4 sides, A, B, C, and D.

To find the length of each side, let's first find the length AE.

From the diagram, AE is half of AC and AC = 30 ft.

Therefore,

AE = ½ * 30

AE = 15 ft

Let's find the length AD, since we are looking for the distance around the perimeter.

AD = \frac{15}{sin30} = \frac{15}{0.5} = 30 ft

We are told the rhombus is formed by four identical triangles.

Therefore the distance around the perimeter would be: AD+AD+AD+AD=

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= 120 ft

The distance around the perimeter of the garden is 120 ft

8 0
3 years ago
Read 2 more answers
Use +,-,x, ÷ and parentheses to connect the numbers 1,3,5 and 7 such that the result is 24.
Alborosie

Answer: (3-1)×(7+5)

Step-by-step explanation:

There are mainly several ways to get 24

- 2×12

- 3×8

- 4×6

- add all of them together

- complicated ones can include large numbers minus another large number

Use try-check-revise, to find the way that fits 24

For this question, we used 2×12, which results in (3-1)×(7+5)

Hope this helps!! :)

Please let me know if you have any questions.

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2 years ago
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Answers:

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3 years ago
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uranmaximum [27]
$1100 x 1.021^7 = $1272 (whole number.)

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