All categories

2 years ago

2 ACTIVITY: Estimating a Percents

Mathematics

2 answers:

Anestetic [448]2 years ago

8 0

18 is what percent of 40?
Answer: 45%

meriva2 years ago

7 0

Answer: 45%

Step-by-step explanation:

Converting the word problem into words, we have:

18= x/100*40

Solving for it, we get that x=45.

You might be interested in

Whats 1/4+9/58*1/2 ???

Marysya12 [62]

Answer: 0. 327

Step-by-step explanation:

I just used a demos calculator I suggest using demos scientific calculator.

5 0

3 years ago

Read 2 more answers

Use completing the square to determine which of the following gives the solutions to 3x2 - 24x + 40 = 28.

jeka94

Answer:

$x=4+2\sqrt{3}$

$x=4-2\sqrt{3}$

Step-by-step explanation:

<u>Completing the square</u>

when $ax^2+bx+c=0$

Given equation:

$3x^2-24x+40=28$

Subtract 40 from both sides:

$\implies 3x^2-24x=-12$

Divide both sides by 3:

$\implies x^2-8x=-4$

Add the square of half the coefficient of $x$ to both sides:

$(\frac{b}{2})^2=(\frac{-8}{2})^2=16$

$\implies x^2-8x+16=-4+16$

Factor the left side and simplify the right side:

$\implies (x-4)^2=12$

Square root both sides:

$\implies x-4=\pm\sqrt{12}$

Add 4 to both sides and simplify the radical:

$\implies x=4\pm\sqrt{4 \cdot 3}$

$\implies x=4\pm\sqrt{4}\sqrt{3}$

$\implies x=4\pm2\sqrt{3}$

5 0

2 years ago

What is the area of the trapezoid?

DiKsa [7]

The answer is actually choice B. To solve for the area of a trapezoid, you would do the formula a+b/2 h.

4 0

3 years ago

Anyone know how to find the length of x using the 30,60,90 method?

QveST [7]

9514 1404 393

Answer:

2√5

Step-by-step explanation:

The side ratios in a 30-60-90 triangle are ...

1 : √3 : 2

The longest side (x) is 2 times the length of the shortest side (√5), so ...

x = 2√5

6 0

3 years ago

Read 2 more answers

Help, please, I’m so confused

mel-nik [20]

Answer:

Uhhh just do all the process corectly :)

6 0

3 years ago

Read 2 more answers