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My name is Ann [436]
3 years ago
5

I’m very stuck and someone give the answer

Mathematics
1 answer:
svlad2 [7]3 years ago
7 0

Answer:

since there are 30 students as a whole and 20 boys make up part of the class, you can assume that there are 10 girls in the class. since the mean mark for boys is 62 I think the mean mark for girls would be 8%

Step-by-step explanation:

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Help
Anika [276]
The answer to your question is D
.5 x 8= 4 pounds
.5 x 10=5 pounds
.5 x 12=6 pounds
.5 x 16=8 pounds

3 0
3 years ago
Read 2 more answers
What is the value of 3-(-2)?
Fed [463]

Answer:

6

Step-by-step explanation:

distribute the negative to ger 3(2), since a negative times a negative is positive. Then just multiply

6 0
3 years ago
Which products result in a difference of squares? Check all that apply. (5z + 3)(–5z – 3) (w – 2.5)(w + 2.5) (8g + 1)(8g + 1) (–
Helen [10]

Answer:

Option 2  (w-2.5)(w+2.5)=w^2-2.5^2\\ and option 4 (-4v-9)(-4v+9)=-(4v+9)(-)(4v-9)=4v^2-9^2

Explanation:

In option 1 (5z+3)(-5z-3)=-(5z+3)(5z+3)=-(5z+3)^2  which is not the difference of squares

In option 2 (w-2.5)(w+2.5)=w^2-2.5^2\\ using the formula

(a+b)(a-b)=a^2-b^2\\Here \\a=w,b=2.5

Clearly, the difference of squares

In option 3(8g+1)(8g+1)=(8g+1)^2 not the difference of squares

In option 4(-4v-9)(-4v+9)=-(4v+9)(-)(4v-9)=4v^2-9^2

Clearly the difference of squares

In option 5 (6y+7)(7y-6)=42y^2+13y-42 not the difference of squares

In option 6 (p-5)(p-5)=(p-5)^2 not the difference of squares

4 0
3 years ago
Read 2 more answers
If f(x) = 4x - 7, what's the value of f(2) ? *<br> O -1<br> O 1<br> O 20<br> O 35
Alla [95]

Step-by-step explanation:

f(x) = 4x - 7

f(2) = 4(2) - 7

f(2) = 8 - 7 => 1

4 0
3 years ago
Simplify the variable expression.<br> 13. (5)(-x)
Travka [436]

Step-by-step explanation:

(5)(-x)

= -5x

multiply both and put the minus /(-) there

4 0
3 years ago
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