MATHEMATICS HIGH SCHOOL

The table shows the battery life of four different mobile phones.Mobile Phone Battery Life
Phone Battery Life
A 20
B 25
C 10
D 18


If 7.75% of the battery life of each mobile phone is used in a day by a typical user, for which mobile phone is 0.775 hour of battery life used in a day?
Phone A
Phone B
Phone C
Phone D

Answers

Answer 1
Answer:

Answer:

Probably phone C

Step-by-step explanation:
Answer 2
Answer:

Answer:

1. B

2. D

hope this helped

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Which number is equivalent to 3⁴÷3² This problem comes straight from a standardized test given in New York in 2014.

Answers

Answer:

9

Step-by-step explanation:

3^4 / 3^2 = 3^(4 - 2)

= 3^2
= 9

Anybody pls help me. Plus, working. Thank you ​

Answers

I hope my answer can help you.

A road has a 10% grade. 1. What is the angle of elevation of the road? 2. If the road is 2km long, how much does it rise?

Answers

1.  m = rise/run
m = 10/100 = 0.1
tan α = 0.1
α = tan^(-1) 0.1 
α = 5.71 °
2. 2 km = 2,000 m
 x² + ( 0.1 x )² = 2,000²
 x² + 0.01 x² = 4,000,000
 1.01 x² = 4,000,000
 x = 1,990 m
 h = 1,990 m * 0.1
 h = 199 m
 The road rises 199 m.

A square has an area of 49 square meters. What is the perimeter of the square? 1) 28 meters 2) 30 meters 3) 32 meters 4) 36 meters

Answers

Answer:

1)28

Step-by-step explanation:

The area of square=49m^2

or,L^2=49

i.e. L=7

also perimeter =4L

or, =4×7

or, perimeter=28m

Fifty divided by a hundred is equivalent to 0.02?

Answers

50 divided by 100 is .50 so no it is not equivalent .

Solve for x:
-2x(x-3)=-11 (correct two decimal place)

Answers

-2x(x-3) = -11

-2x(x) -2x(-3) = -11
-2x² + 6x = - 11
-2x² + 6x + 11 = 0

Let us use the quadratic formula in solving for the value of x.

-2x² + 6x + 11 = 0

a = -2 ; b = 6 ; c = 11

x = (-b + √b² -4ac) ÷ 2a

x = (-6 + √6² - 4(-2)(11)) ÷ 2(-2)
x = (-6 + √36 + 88) ÷ -4
x = (-6 + √124) ÷ -4
x = (-6 + 11.14) ÷ -4
x = 5.14 ÷ -4
x = -1.285 or -1.29

x = (-6 - 11.14) ÷ -4
x = -17.14 ÷ -4
x = 4.285 or 4.29
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