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vovangra [49]
3 years ago
9

Y-(-5) = -7 what does y equal

Mathematics
1 answer:
11Alexandr11 [23.1K]3 years ago
7 0
The two negatives means you're gonna change it to a positive so that will be
y + 5 = -7 
y = -12
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Need help on my math!!!!!!!
Natalka [10]
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3 0
3 years ago
To create a giant gemstone, sara first made two identical square pyramids that each had a base area of 100 square inches. Then s
inysia [295]

Answer:

8 inches.

Step-by-step explanation:

From the statement we have that they first made two identical square pyramids, each with a base area of 100 square inches.

Ab = s ^ 2 = 100

Therefore each side would be:

s = (100) ^ (1/2)

s = 10

So, side of the square base = 10 inches

Then they tell us that they glued the bases of the pyramids together to form the precious stone. The surface area of the gemstone is 520 square inches, so for a single pyramid it would be:

Ap = 520/2 = 260

For an area of the square pyramid we have the following equation:

Ap = 2 * x * s + s ^ 2

Where x is the height of each triangular surface and s is the side of the square base

Replacing we have:

260 = 2 * x * 10 + 10 ^ 2

20 * x + 100 = 260

20 * x = 160

x = 160/20

x = 8

Therefore, the value of x is 8 inches.

5 0
3 years ago
Look at the graph. which equation represents the graph?
Svetllana [295]
The correct answer is A
4 0
2 years ago
A student solved this problem and said the answer was 78.
katovenus [111]
It's B.) The student’s answer is not reasonable. Estimation: 170 + 90 = 260
8 0
2 years ago
Read 2 more answers
A fan is marked up 40% on the original price. The original price was $20. What is the new price of the fan before sales tax?
Andre45 [30]

Answer:

  $28

Step-by-step explanation:

The markup was 0.40×$20 = $8, so the new price is ...

 $20 +8 = $28

7 0
3 years ago
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