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Bess [88]
3 years ago
14

Can any one answer everything

Mathematics
1 answer:
Roman55 [17]3 years ago
3 0
I don’t really understand for question 11 to 13

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The length of a diagonal of a square is 7.5 mm. Find the area of the square.
dexar [7]
By Pythagoreans' theorem,

7.5² = l² × b²
56.25 = l² × b²

Since l = b
56.25 ÷ 2
= l²/b²
= 28.125 mm

∴ l = √28.125
= 5.3033 mm

Area of square
= √28.125 × √28.125
= 28.125 mm²
≈ 28.1 mm² (3s.f.)
7 0
3 years ago
Expand.<br> Your answer should be a polynomial in standard form.<br> (7g+2)(5g+4)=
Ivahew [28]

Answer:

35g^2 +38g +8

Step-by-step explanation:

6 0
3 years ago
Divide 6 1/3 by 3/7
ryzh [129]
First, make 6 1/3 a improper fraction: 6 \frac{1}{3}= \frac{19}{3}}. Now we have 19/3*7/3: \frac{19}{3}* \frac{7}{3}= \frac{133}{9}.
3 0
3 years ago
Read 2 more answers
Trig help please, 2 questions, 10 pts
Scrat [10]
1. 2700 degrees. 450 rotations in on minute is 450(360) degrees per minute. If you divide this by 60 you get 2700. 
2. 180 degrees. 4.3 rotations per minute is 4.3 times 360 degrees per minute. Multiply that times 5, and divide the answer by 360 and you get 21.5, which means he is 180 degrees from his starting point. 
4 0
3 years ago
Simplify negative 7 and 1 over 8 − negative 9 and 1 over 2
Kryger [21]

Answer:

You can put it into 3 forms:

Exact form: 19/8

Decimal Form: 2.375 (Rounded=2.38)

Mixed Number Form: 2 3/8

4 0
3 years ago
Read 2 more answers
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