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puteri [66]
3 years ago
12

How do you solve number 27 and 28

Mathematics
1 answer:
Elanso [62]3 years ago
8 0

27) if a = 1/a

multiply both sides by a

a * a = 1/a * a

a^ 2 = 1

Answer is D) 1

28)

6 x 75 = 450

7 x 80  = 560

8 x 85 = 680

9 x 90 = 810

Total all students in class = 6 + 7 + 8 + 9 = 30 students

Total score of whole class:

450 + 560 + 680 + 810 = 2500

Average = 2500 /30 = 83.3 = 83 1/3

Answer is C) 83 1/3

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The distance from B to B' is 6 and the distance from A to B' is 2. What is the scale factor?choice:1/41/343
Mkey [24]

In this case, we'll have to carry out several steps to find the solution.

Step 01:

Data:

BB' = 6

B'A = 2

Step 02:

scale factor:

\frac{BB^{\prime}}{B\text{'A}}{}=\frac{6}{2}=3

The answer is:

scale factor = 3

3 0
1 year ago
What is the common denominator as a fraction of 8/21
natulia [17]
How to reduce (simplify) ordinary fraction 8/21? Fraction can't be reduced (simplified). 8/21 = 0.380952380952; Result written as a positive proper fraction and a decimal number. Ordinary (simple, common) math fraction reducing to lowest terms (simplifying), answer with explanations below
4 0
4 years ago
Trevon, Leah, and Beth are playing a computer game. Trevon scores -8. Beth’s score was 3/4 of trevons score, and Leah’s score wa
nevsk [136]
-8 = trevon

(3/4)-8 = beth
= -6

1/4[(3/4)-8] = leah
1/4(-6)
= -1.5
3 0
3 years ago
Read 2 more answers
1. b+4= 2.4 2. 3.6 = 1.2g 3. 3.75x = 3 4. w-9 = -4.1 5. -7.4 = 8.8 + p 6. 2.9 = y - 6.3 7. A+5.7 = 1.5 8. -3.5 = V/0.2 9. Z/9 =
Marrrta [24]
1. b=2.4-4
b= -1.6

2. 1.2g/1.2 = 3.6/1.2
g=3

3. 3.75x/3.75 = 3/3.75
x= 0.8

4. w = -4.1 + 9
w= 4.9

5. p = -7.4 - 8.8
p= -16.2

6. y = 2.9 + 6.9
y = 9.8

7. A= 1.5 - 5.7
A= -4.2

8. V/0.2 * 0.2 = -3.5 * 0.2
V= -0.7

9. Z/9 * 9 = 1.6 * 9
Z= 14.4

10. -9.9t/-9.9 = -9.9/-9.9
t= 1
7 0
3 years ago
Read 2 more answers
A surveyor starts at the southeast corner of a lot and
elena-s [515]

Find the difference vertically( North and South) and the difference horizontally ( East and West)

Then use  the Pythagorean Theorem.

600 North - 200 South = 400 m

400 West - 100 East = 300 m

Now using the Pythagorean Theorem;

400^2 + 300^2 = total displacement^2

Total displacement^2 = 160,000 + 90,000

Total displacement^2 = 250,000

Total displacement = √250,000

Total displacement = 500 m

7 0
3 years ago
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