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Ipatiy [6.2K]
3 years ago
10

Work out (4.2×107)÷(7×104)Give your answer in standard form. Work out (4.2×107)÷(7×104)Give your answer in standard form.

Mathematics
1 answer:
professor190 [17]3 years ago
6 0

Answer:

6 * 10^2

Step-by-step explanation:

Simplify : (4.2×10^7)÷(7×10^4)

(4.2 × 10^7) / (7 × 10^4)

From indices : 10^a ÷ 10^b = 10^(a - b)

(4.2 / 7) * 10^(7-4)

0.6 * 10^3

= 6 * 10^2

Hence, (4.2×10^7)÷(7×10^4) = 6 * 10^2

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Kobotan [32]
We have an triangle:
base=4 in
height=3 in,
This triangle can be dividided into two equal triangles, we need calculate the hypotenuse.
leg₁=4 in/2=2 in
leg₂=3 in

Pythagoras law:
hypotenuse²=leg₁²+leg₂²
hypotenuse²=(2 in)²+(3 in)²
hypotenuse²=4 in²+9 in²
hypotenuse²=13 in²
hypotenuse=√13 in.

Now, we can find the surface area.
Surface area=2 *(rectangle area)+base area + 2(triangle area)
rectangle area=10 in x √13 in=10√13 in²
base area=10 in  x 4 in=40 in²
Triangle area=(4 in x 3 in)/2=6 in²

Surface area=2(10√13 in²)+40 in²+2(6 in²)=(20√13+52) in²≈124.11 in²

Answer: 124.11 in²
7 0
3 years ago
Read 2 more answers
In a random sample of 50 West High School students, 14 students have a pet. If 500 students attend West
Korvikt [17]

Answer:

the answer is 140

Step-by-step explanation:

5 0
3 years ago
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A vacant city lot is being turned into a neighborhood garden. The neighbors want to fence in a triangular section of the lot and
ozzi

9514 1404 393

Answer:

  17 ft, 27 ft, 20 ft

Step-by-step explanation:

Let s represent the length of the shortest side. The the longest side is (2s-7) and the third side is (s+3). The perimeter is the sum of the side lengths:

  64 = s +(2s -7) +(s +3)

  64 = 4s -4 . . . . . . . . . . . collect terms

  16 = s -1 . . . . . . . . . . divide by 4

  17 = s . . . . . . . . . add 1

  2s -7 = 2·17 -7 = 27 . . . . . the length of the longest side

  s +3 = 17 +3 = 20 . . . . . . . the length of the third side

The side lengths are 17 feet, 27 feet, and 20 feet.

8 0
2 years ago
two straight lengths of wire are placed on the ground forming vertical angles if the measure of one of the angles formed is 72 d
pickupchik [31]
If angles are vertical it means opposite angles are the same size. Therefore the measures of the other three angles are 72 degrees, 108 degrees, and 108 degrees. I hope this helps!
5 0
3 years ago
What does this equal 2^3 + 6^5=
stealth61 [152]

\\ \sf\longmapsto 2^3+6^5

\\ \sf\longmapsto 2^3+(2\times 3)^5

\\ \sf\longmapsto 8+2^5\times 3^5

\\ \sf\longmapsto 8+32\times 243

\\ \sf\longmapsto 40+7776

\\ \sf\longmapsto 7784

4 0
2 years ago
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