MATHEMATICS HIGH SCHOOL

What percent increase is it to go from $1.25 to $1.50?

Answers

Answer 1
Answer: 1.25x=1.50. Solve for X and covert 1.2 into a percentage by multiplying by 100 which is 120%.

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Diagram shows a section of a bridge between the points A and K. The length of line segment is 640 meters. ∆ABC, ∆CDF, and ∆FJK are similar, and 2AC = CF = 2FK. The first pillar, , is 20 meters tall.The area of ∆CDF is square meters.

Answers

AK = 640
Δ ABC and ΔFJK are similar. They are small triangles.
ΔCDF is the big triangle.

640 / 2 = 320 m= CF
AC & FK= 320/2 =  160 m each

2AC = CF = 2FK
2(160) = 320 = 2(160)

BG = 20 m

20/160 = x / 320
20*320 = 160x
6400 = 160x
6400/160 = x
40 = x

Area of CDF = (40 m * 320 m)/2 = 12,800 / 2= 6,400 m²

6,400 meters squared on plato. Just took the test and it is correct.

NEED HELP ASAP
Solve 4 – x = –8.

Answers

Answer:

i think it is 12 positive

Step-by-step explanation:

i think

If an object is dropped from a height of 85 feet, the function h(t)=-16t^2+85 gives the height of the object after t seconds. Approximately, when will the object hit the ground?a. 85.00 seconds
b. 69.00 seconds
c. 0.33 seconds

Answers

c because all you need to do is compare the 2 variables and then add the variables and the multiply it and then divide it. Then your golden.

Is 0.789 greater than 0.7 or less then it?

Answers

The answer is 0.789
So that means 0.789 is greater than 0.7
Hope this helps  :)

Cambridge has a job mowing lawns. He mowed 5 lawns last week and earned $82.50. The table shows his earnings for the week. Which coordinate pair represents the unit rate for this situation?A) (0, 0)
B) (1, 16.5)
C) (3, 49.5)
D) (5, 82.5)

Answers

Answer:

Option B.

Step-by-step explanation:

Consider the below table attached with this question.

It is given that Cambridge has a job mowing lawns. He mowed 5 lawns last week and earned $82.50.  

We need to find the coordinate pair that represents the unit rate for this situation.

Unit rate represent the value of dependent variable when the value of independent variable is 1.

In the given situation, dependent variable is earnings and independent variable is number of lawns.

5 lawns = $82.50

Divide both sides by 5.

1 lawns = $16.5

So, the unit rate rate is $16.5 and the required coordinates are (1,16.5).

Therefore, the correct option is B.

i think so its B 82.50÷5=16.5

Find the exact roots of x^2+10x-8=0 by completing the square

Answers

From the original equation x^2+10x-8=0, move the loose number on the other side. Your new equation will be x^2+10x=8. Moving an element from one side to another reverses its sign. From -8 to +8. Then take half of the x-term and square it and add it on both sides. X-term is 10x and 10 is the number, half of it is 5 then square of 5 is 25. Add 25 on both side. Your new equation will be x^2+10x+25=8+25. Then complete the square form of the left side of the equation, (x+5)^2=33. Square root both side then you will get x+5=squareroot of 33. Your x = -5 plus/minus squareroot of 33.
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