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2 years ago

720 students took part in the survey. Only 45% were female.

Mathematics

2 answers:

Mila [183]2 years ago

6 0

Answer:

396 males

Step-by-step explanation:

First, let's find the percentage of males who took part in the survey.

100% - 45% = 55%.

Now, let's find 55% of 720.

Step 1: Multiply 55 by 720

55 × 39600

Step 2: Divide 39,600 by 100.

39600/100
396 males

Have a lovely rest of your day/night, and good luck with your assignments! ♡

Maurinko [17]2 years ago

5 0

Answer:

396 males

Step-by-step explanation:

720 * 0.45 = 324 females

720 - 324 = 396.

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Train A leaves New York for California at the same time Train B leaves California for New York. They are 2900 miles apart. They

professor190 [17]

Answer:

(A) 120 mph

(B) -120 mph

Step-by-step explanation:

Given that,

New York and California are 2900 miles apart,

Both the trains A as well as B travel at an average speed of 120 mph.

Assuming that the path between the starting point in New York and the ending point in California is straight, so the given distance of 2900 miles is actually the shortest distance which is the displacement between the source and destination.

So, the given speed on the straight path is actually the velocity.

Assuming that the velocity is positive in the direction from New York towards California.

(A) So, the velocity of train A (towards California) = 120 mph.

(B) The velocity of train B (towards New York) = -120 mph.

(C) Bothy are moving towards each other, so the relative velocity between them is 120+120=240 mph, and the initial distance between them is 2900 miles.

When they meet, the displacement between them becomes zero, displacement covered= 2900-0=2900 miles.

So, the time, t, taken to cover the displacement 2900 miles with a relative velocity of 240 mph is

$t=\frac{2900}{240}$ [as time= displacement / relative velocity]

$\Rightarrow t=12\frac{1}{12}$ hours

=12 hours 5 minutes.

7 0

3 years ago

flvs hope If $x^2+bx+16$ has at least one real root, find all possible values of $b$. Express your answer in interval notation.

Galina-37 [17]

If x^2+bx+16 has at least one real root, then the equation x^2+bx+16=0 has at least one solution. The discriminant of a quadratic equation is b^2-4ac and it determines the nature of the roots. If the discriminant is zero, there is exactly one distinct real root. If the discriminant is positive, there are exactly two roots. The discriminant of x^2+bx+16=0 is b^2-4(1)(16). The inequality here gives the values of b where the discriminant will be positive or zero:
 b^2-4(1)(16) ≥ 0
 b^2-64 ≥ 0
 (b+8)(b-8) ≥ 0
The answer is that all possible values of b are in the interval (-inf, -8]∪[8,inf) because those are the intervals where (b+8)(b-8) is positive.

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2 years ago

What is the value of (7 + 4) to the second power (number 19)

Ber [7]

(7+4) = 11 so 11 squared (11×11) is 121. The correct answer is 121

4 0

3 years ago

Read 2 more answers

Help asap!! 15 points!!

adoni [48]

Answer:

a) y = -500x + 130,000

b)67,500 gallons remaining

c) 260 hours

Step-by-step explanation:

Since water is being removed at a rate of 500 gallons per hour, the slope would be a negative.

a) y = -500x + 130,000

For part b input 125 for x:

y = -500(125) + 130,000

y = 67,500

There are 67,500 gallons remaining

For part c we are solving for the x intercept

0 = -500x + 130,000

Subtract 130,000 from both sides

-130,000 = -500x

x = 260

It will take 260 hours for the pool to completely drain

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3 years ago

Can you show me how to solve 33=-2a+7

Klio2033 [76]

33=-2a+7
33-7=26
-2xa=26
26 divide -2=-13
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I believe

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3 years ago