MATHEMATICS MIDDLE SCHOOL

Elevii clasei a IV-a au fost la patinoar. Stiind ca numarul baietilor reprezinta jumatate plus 3 din numarul copiilor si ca numarul fetelor este 10, afla cati copii au fost la patinoar.

Answers

Answer 1

Answer:

Step-by-step explanation:

Să presupunem că x să fie numărul de copii

$De\:asemenea$

să fiu fetele

$f = 10$

și

$b\:=\:(x)/(2)\:+\:3$

$f\:+\:b\:=\:x$

substituirea valorilor

$10\:+\:(x)/(2)\:+\:3\:=\:x$

$20\:+\:x\:+\:6\:=\:2x$

$x\:=\:26$ copii au fost la patinoar

$b=(26)/(2)+\:3$

$b\:=\:16\:baieti$

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A quadrilateral has angles that measure 87°, 69°, and 104°. What is the measure of the fourth angle?

Answers

The answer should be ................... 100

Sum of angles of quadrilateral = 360

87 + 69+ 104 + x = 360

156 + 104 +x = 360

260 + x = 360

thus, x = 100

Thus, the measure of the fourth angle is 100 degrees

What is 28% of 80? please answer as a decimal

Answers

Answer:

22.4

Step-by-step explanation:

Is means equals and of means multiply

W = 28% * 80

Change to decimal form

W = .28 * 80

W = 22.4

28 percent of 80 is 22.4

Answer:

22.4

Step-by-step explanation:

80/x = 100/28

80/x = 3.57142857143

times both sides by x

x cancels out on the left and leaves on the right 3.57142857143x

80/3.57142857143 = x

22.4 = x

A car averages 27 miles per gallon. If gas costs $4.04 per gallon, which of the following is closest to how much the gas would cost for this car to travel 2,727 typical miles?a. $44.44

b. $109.08

c. $118.80

d. $408.04

e. $444.40

Answers

(D) 408.04 is the correct answer. If you divide 2,727 miles by 27 miles per gallon you will get the number of gallons: = 101. Then, multiply the number of gallons by the cost per gallon: 101(4.04) = 408.04. This gives the cost of gas for this car to travel 2,727 typical miles. Hope this helps!

d. $ 408.04 is the answer

A typist takes 8 minutes to type 360 words.How many minutes will he take to type 225 words?
A. 5 minutes
B. 4 minutes
C. 3 minutes
D. 13 minutes

Answers

Answer:

A. 5 minutes

Step-by-step explanation:

We can solve this question using proportions

Let x be the number of minutes needed to type 225 words.

8 minutes = 360 words

x = 225 words

Cross-multiply

360 × x = 225× 8

360 x = 1800

Divide both-side of the equation by 360

$(360x)/(360)$ = $(1800)/(360)$

(On the left-hand side of the equation, 360 at the numerator will cancel-out 360 at the denominator, while on the right-hand side of the equation 1800 will be divided by 360)

x= 5 minutes

Therefore, it will take 5 minutes to type 225 words

Well, it cant be option B because then it wuld be half the time (180 mins.)

It cant be option D becasue then it would be over 360 mins, seeing that it only took 8 mins to type 360

And it cant be option C beacuse it would be too small, if 4 mins is to small then 3 mins is worse

Your answer would be A 5 minutes it's just a little bit above 4 mins(half)

Use Pythagorean theorem to find the missing side of the triangle.