MATHEMATICS MIDDLE SCHOOL

Numerical expression add 8 and 7 and then multiply by 2​

Answers

Answer 1
Answer:

Answer:

(8+7)*2

(15)*2

30
Answer 2
Answer:

Answer:

2(8+7)

Step-by-step explanation:

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A rectangle has a perimeter of 80 inches. Write an equation to represent the area A in terms of width w. Do I use the perimeter?

Answers

Answer:

A = 40w-w^2      

Step-by-step explanation:

We are given the following in the question:

Perimeter of rectangle = 80 inches.

Let l be the length and w be the width of rectangle.

Perimeter of rectangle =

P= 2(l+w)

Putting values, we get,

80 = 2(l+w)\n40 = l+w\n\Rightarrow l = 40 - w

Now, we have to find the area of the rectangle in terms of w.

Area of rectangle =

A = l* w

Putting values, we get

A = (40-w)w\nA = 40w-w^2

is the required expression of area of rectangle in terms of w.

Yes, the perimeter is used to calculate the length of the rectangle in the term of w.

Anne has 24 more cards than Devi.  Anne finds that 3/5 of Devi's cards are equal to 1/2 of her cards.  How many cards does Anne have?

Answers

LET ANNE HAS X NUMBER OF CARDS
LET DEVI HAS Y NUMBER OF CARDS
X-Y= 24  ------EQ 1
3/5Y=1/2X
6Y=5X    (cross multiplying)-------EQ 2
FROM EQ 1 WE GET
X=24+Y
substituting the value of x in eq 2, we get
6y=5(24+y)
6y =120+5y
y= 120


NOW, PUTTING THE VALUE OF Y IN EQ 1
X-120=24
X=24+120
X=144
THEREFORE, ANNE HAS 144 CARDS
a=Anne's cards
D= Devi's cards
d+24=a
3d/5=a/2
6d/5=a
6d/5=d+24
6d/5-d=24
6d-5d=120
d=120
a=144

In one season Ana ran 18 races. This was four fewer races than twice the number of races Kelly ran. How many races did Kelly run?Please have equation and use a variable in the equation
No need to solve just need equation

Answers

Well twice the amount of 18 is 36 races subtract the four less she ran is 32

32 races.

V=u+at
u= 2
a= -5
t=1/2
what is the value of v

Answers

at= -5(1/2)
at= -2.5
v= u + at
v= 2 + (-2.5)
v= -0.5

v=-8 if u equals 2 and a is -5 and t is 1/2 its 2 plus -5 divided by one half or 0.5. you first divide and get -10 plus 2 equals -8

Express 5/7 as a decimal.

Answers

Answer:

0.71428571428

Step-by-step explanation:

Do it the old fashioned way, get out your calculator, or google it.

Answer:

0.71428571428

Step-by-step explanation:

Just divide using paper or use your calculator

33 is 50% of what number?

Answers

50/100 * x = 33
x = 33 * 100/50
x = 66 
so your answer is 66
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