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xxMikexx [17]
3 years ago
8

Please answer thx so much

Mathematics
1 answer:
const2013 [10]3 years ago
6 0

Answer: E

Step-by-step explanation:

length: 3w

width: ?

perimeter: 20 inches

Formula: P=2(l+w)

Plug your values into the formula.

20=2(3w+w)

Divide by 2.

\frac{20}{2}=3w+w

Combine like terms and simplify.

10=4w

Divide by 4

\frac{10}{4}=w\\\frac{5}{2}=w

Now determine the length, replacing the value of w.

3(\frac{5}{2})=\frac{15}{2}

Now, to find the area, use the following formula: A=l*w

A=(\frac{15}{2})(\frac{5}{2})\\A=\frac{75}{4}\\ A=18.75in^2

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Create<br> height<br> question about<br> Grade 7
frez [133]

Answer:

wdym like create a question about height that includes 'Grade 7' in it?

Step-by-step explanation:

4 0
2 years ago
The radius of the cylinder is 12cm and the height is 7cm
Anit [1.1K]

Answer: 1432.752cm2

Step-by-step explanation:

Surface area of a cylinder is 2πr2+2πrh

R=12cm

H=7cm

Surface area= 2×3.142×12×12 + 2×3.142×12÷7

Surface area= 904.896+527.856

Surface area= 1432.752cm2

7 0
3 years ago
M and n are both integers. Select all the statements that are true if m and n are also equal to each other. m - n = n - m OR +m
alexandr402 [8]

Answer:

The true statements are;

(i) m - n = n - m

(ii) +m (-n) = m - n

(iii) 0 = m - n

Step-by-step explanation:

We are given that m and n are both integers and we have to select all the statements that are true if m and n are also equal to each other.

(i) The given situation is: m - n = n - m

LHS = m - n

       = m - m   {because m and n are equal}

       = 0

RHS = n - m

       = n - n   {because m and n are equal}

       = 0

Hence, the given statement is true because LHS = RHS = 0.

(ii) The given situation is: +m (- n) = m - n

LHS = +m (- n)

       = m - n

       = m - m  {because m and n are equal}

       = 0

RHS = m - n

       = n - n   {because m and n are equal}

       = 0

Hence, the given statement is true because LHS = RHS = 0.

(iii) The given situation is: 0 = m - n

LHS = 0

RHS = m - n

       = m - m   {because m and n are equal}

       = 0

Hence, the given statement is true because LHS = RHS = 0.

(iv) The given situation is: m + n = 0

RHS = 0

LHS = m + n

       = m + m   {because m and n are equal}

       = 2m

Hence, the given statement is not true because LHS \neq RHS.

3 0
3 years ago
Read 2 more answers
use the graph to find the solution to the system of equations. Write your answer as an ordered pair . Y=x+3 and y=2x-1
alekssr [168]
I believe the answer would be (-3,-5).
Place the equations on top of each other and figure out how to cancel out one of the digits to get your answer. Try canceling out 2x. Multiply the entire equation y=x+3 by -2 to contradict the second equation. y=x(-2)+3(-2) then you'd get y=-2x-6. -2x-6 above 2x+1, solve. -2 and 2 cancel out so you're left with -6+1, therefore, y=5. Now that you have your y, you must solve for x. Using substitution to solve the equation (I picked 2x+1) you'd get -5=2x+1. Subtract 1 on both sides. +1-1=0 so that cancels out. -5-1=-6 and you're left with -6=2x. So you subtract 2 on both sides because 2 has the variable, and you are left with x=-3. Therefore, the answer is (-3,-5).
6 0
3 years ago
6x-5=5x+8. Help me Find x
sleet_krkn [62]

Answer:

x=13

Step-by-step explanation:

You add 5 to both sides, cancelling it out on the left and making the 8 a 13. Now you have 6x=5x+13

Now you subtract 5x from both sides and that leaves you with x=13

6 0
2 years ago
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