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Semmy [17]
3 years ago
7

I need help like really bad.. pls help..

Mathematics
2 answers:
vodomira [7]3 years ago
4 0

Answer:

x/50=78/100

Explanation:

since the test has 50 points TOTAL, you know that it will be the denominator. and x would be however many points he got on the test. so out of 50 points, the student got x points is what x/50 means. then the second one would be your percentage. when converting percents do decimals, the number of your percent (in this case 78) would be your numerator, and since percents are out of 100 your denominator would be 100

Artyom0805 [142]3 years ago
3 0
X is 39 sorry I don’t rlly know hahahahahahaha
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What is the difference between 50 and -50?
Norma-Jean [14]

Answer:

100

<h2>Hope this helps! Have a nice life! ✌</h2>
7 0
3 years ago
Slope of a line that passes through points (1,7) and (3,3)
Nadusha1986 [10]
-2 is the answer because you do the change of y over the change of x.
3 0
4 years ago
Can anyone answer these questions
SOVA2 [1]

Answer:

see explanation

see explanationStep-by-step explanation:

21

Note that

(a - \frac{1}{a})²

= a² - 2 + \frac{1}{a^2}

= a² + \frac{1}{a^2} - 2

= 11 - 2

= 9

Thus

(a - \frac{1}{a})² = 9 ( take the square root of both sides )

a - \frac{1}{a} = 3

22

Since the expression is a perfect square, then

(4x + 5y)²

= 16x² + 40xy + 25y²

Comparing coefficients, then

a - 1 = 40 ( add 1 to both sides )

a = 41

23

99² - 87² ← is a difference of squares and factors as

= (99 - 87)(99 + 87)

= 12 × 186 = 1152, thus

24a = 1152 ( divide both sides by 24 )

a = 48

3 0
4 years ago
An author is having a book signing at a store. He agrees to give 5% of his profit to literacy programs and 15% of his profit to
quester [9]

Answer:

160

Step-by-step explanation:

15% + 5% = 20%

80%=0.8

200x0.8=160

6 0
3 years ago
Please help!!!<br><br> find y and x
andrew11 [14]

Answer:

  a)  y = 16/x²

  b)  x = 4/5

Step-by-step explanation:

You want the equation for y in terms of x when y is inversely proportional to the square of x, and y is 16 when x is 1. Further, you want the value of x when y is 25.

<h3>(a) Relation</h3>

The wording "inversely proportional to the square" means the form of the equation is ...

  y = k/x² . . . . . . where k is the constant of proportionality

The value of k can be found from the given (x, y) pair.

  k = x²y = (1)²(16) = 16

The equation is ...

  y = 16/x²

<h3>(b) Value of x</h3>

Solving for x gives ...

  x = √(16/y)

Then the value of x for y = 25 is ...

  x = √(16/25)

  x = 4/5

5 0
2 years ago
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