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3 years ago

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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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:

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) ? * O -1 O 1 O 20 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. 13. (5)(-x)

Travka [436]

Step-by-step explanation:

(5)(-x)

= -5x

multiply both and put the minus /(-) there

4 0

3 years ago