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3 years ago

PLEASE ANSWER THESE MATH QUESTIONS. I NEED TO ACE THIS

Mathematics

1 answer:

Elena-2011 [213]3 years ago

5 0

Answer:

all i know is that the last slide is D the last one

hope this helps :)

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20.

andriy [413]

Answer:

an apple costs 0.24 and a pear costs 0.28

Step-by-step explanation:

3a + 4p = 1.84 3a + 4p = 1.84

-5a + 2p = 1.76 m(-2) -10a - 4p = -3.52

3a + 4p = 1.84

+ -10a - 4p = -3.52

-7a = -1.68

a = -1.68/-7

a = 0.24

3a + 4p = 1.84

3(0.24) + 4p = 1.84

0.72 + 4p = 1.84

4p = 1.84 - 0.72

4p = 1.12

p = 0.28

8 0

2 years ago

Two-thirds of a class are boys. If there are 12 boys, then how many girls are in the class?

son4ous [18]

Step-by-step explanation:

so 2/3 OF the class are boys...

***REMEMBER IN MATHEMATICS, ^OF^ IS USED TO SAY MULTPLICATION***

so 2/3 OF class(x) are boys and there are 12 boys...

so 2/3 * x = 12

12 / (2/3) = x

to solve use the Keep, Change, Flip method

Keep 12, change / to multiplication, flip 2/3 to 3/2

it becomes 12 * 3/2 and to solve easier 12 is same thing as 12/1

12/1 * 3/2

Multiply across (numerator by numerator and denominator by denominator)

(12*3) / (1*2) = 36 / 2

Simplify

So the class has 18 students, and 2/3 of boys (12 of the students)

we can solve for how many girls are in the class

Depending on how your teacher wants to see the work:

either 18 - 12 = 6

or 1/3 * 18 which we rewrite as 1/3 * 18/1 = (1*18)/(3*1) which is 18/3... simplified it is 6

There are 6 girls in the class.

Hope this helps! :)

6 0

2 years ago

(b) The man is going to exit the stairwell at the 4th floor, which is at a height of 42 feet above

atroni [7]

The time taken to get to the 4th can be obtained by dividing the distance given by the speed of the lift.

Distance, height from ground to 4th floor = 42 feets

Time taken to get to the 4th floor = t

Recall :

Time = Distance / speed

We aren't given the speed of the lift ;

Assume speed of lift is 7 ft/sec

The time taken to get to the 4th floor will be :

$t = \frac{42}{7} = 6 \: seconds$

Therefore, to obtain the time taken, divide the distance or height of the 4th floor by the speed of the lift.

Learn more : brainly.com/question/13218948

7 0

2 years ago

This beach ball has a surface area of 615.44 inches². What is its diameter? Use 3.14 for π.

aleksandr82 [10.1K]

Answer:

Step-by-step explanation:

6 0

3 years ago

the half-life of isotope X is 2.0 years. How many years would it take for a 4.0mg sample of X to decay and have only 0.50 mg of

shepuryov [24]

After 2.0 years, the 4.0 mg sample decays to 2.0 mg.

After another 2.0 years (total 4.0 years), the 2.0 mg sample decays to 1.0 mg.

And after another 2.0 years (total 6.0 years), the 1.0 mg sample decays to 0.50 mg.

So it takes 6.0 years for 4.0 mg to decay to 0.50 mg.

4 0

2 years ago