MATHEMATICS MIDDLE SCHOOL

2+2 I knew the answer one time

Answers

Answer 1

Answer:

Answer:

i-its 4....

Step-by-step explanation:

It could be 22 tho. but its 4 ->-

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A glacier advanced 12 feet during a 16-day period in January. The same glacier advanced 18 feet during a 24-day period in February. Are the ratios of feet to days proportional for these two periods of time? explain in two sentences how you got your anwser

Answers

Yes, both of these ratios are proportional. You could either plug it into an equation and solve it, or do like I did and divide. If you divide 16 by 12, you get 0.75. If You divide 24 by 18, you also get 0.75, therefore they are equal. The reason why I divided by the numbers that I did is because you're trying to figure out how much it increased and if it was equivalent. They increased 0.75% of their size that they started with. I hope this helps!

A triangle has an angle that measures 80°. The other two angles are in a ratio of 7:13. What are the measures of those two angles?

Answers

The angles are B and C.

The three angles add up to 180º
A=80º
B
C

A+B+C=180º
80º+B+C=180º
B+C=180º-80º
B+C=100º (1)

The ratio between A and B is 7/13 ; therefore:
B/C=7/13 ⇒B=7C/13 (2)

With the equations (1) and (2), we make a system of equations:

B+C=100
B=7C/13

We can solve this system of equations by substitution method:
7C/13 + C=100
least common multiple=13
7C+13C=1300
20C=1300
C=1300/20
C=65

B=7C/13
B=7*65/13
B=455/13
B=35º

Answer: The measures of those two angles are 65º and 35º.

There are 30 students in Mrs. Dinets’s class. If 27 of the students have brown eyes, what percent of the class has brown eyes?

Answers

Answer:

90% of the class has brown eyes

Step-by-step explanation:

$(x)/(100)$ = $(27)/(30)$

27 x 100 = 2700/30 = 90 so 90%

Can you simplify 7/63. ( If you can show your work)

Answers

7/63 can be simplified down to 1/9 because if you were to multiply 7 by 9 you would get 63? or an easier way to do it would be to divide 63 by 7

I highlighted your answer.

Jana is taking pledges for a bike-a-thon fundraiser. Ivan pledged $4.25, plus $1.25 for eachmile that Jana bikes. Vicky pledged $5.75, plus $0.75 for each mile that Jana bikes.
Part A
Write expressions for the number of dollars Ivan pledged and the number of dollars Vicky
pledged. Use m for the number of miles that Jana bikes.
Part B
Add the two expressions from Part A to find the combined amount that Ivan and Vicky
pledged in terms of m.
Part C
Find an expression equivalent to the one from Part B by factoring out the greatest common
factor from the two terms.

Answers

Jana is taking pledges for a bike-a-thon fundraiser.

Part A

Ivan: $4.25 + $1.25m

Vicky: $5.75 + $0.75m

where m is the number of miles jana bikes

Part B

Total = ($4.25 + $1.25m) + ($5.75 + $0.75m)

Total = $4.25 + $5.75 + $1.25m + $0.75m

Total = $10.00 + $2m

Part C

Total = $2 (5+m)

Part A
Ivan- 4.25+1.25x
x=number of miles rode
Vicky- 5.75+0.75x
x=number of miles rode

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60
120
160