3 years ago

The average of 3, 15, and my number is 40. What is my number? I'll give 30 points!

Mathematics

1 answer:

stepan [7]3 years ago

3 0

Answer:

102

Step-by-step explanation:

The average is calculated using

average = $\frac{totalscore}{count}$

let your score be x, then

$\frac{3+15+x}{3}$ = 40 ( multiply both sides by 4 )

18 + x = 120 ( subtract 18 from both sides )

x = 102 ← your number

You might be interested in

What is the y-coordinate of the solution to this system of equations? 5x-8y=1 3x+6y=-21

Vanyuwa [196]

5x-8y=1...(1)
3x+6y=-21...(2)

(1)*3:
15x-24y=3...(3)

(2)*5:
15x+30y=-105...(2)

(3)-(2):
15x-24y-(15x+30y)=3-(-105)
15x-24y-15x-30y=108
-54y=108
y=-2

6 0

3 years ago

Find the smallest no...... only genius 1 .245, 45 ,67, 2

Vlad [161]

Answer:

.245

Step-by-step explanation:

brainliest pls thanks bro

3 0

3 years ago

Read 2 more answers

Which number line shows the solution of -5x + 10 > -15?

Allushta [10]

Answer:

See attached. Line for x<5.

Step-by-step explanation:

Solve the equation for x. Remember that the "<" and ">" signs are reversed when dividing or multiplying by a negative value.

8 0

2 years ago

The minute hand of a clock is 7 inches long. how far does the tip of the minute hand move in 5 minutes? if necessary, round the

Alina [70]

7/6π" (or 1.17π"). To find the circumference (therefore the distance the hand travels) you do 2rπ (radius is 7in), which is 14π, then divide it by 12 bc the hand is only moving five minutes (which is simplified to 7/6π). You can't simplify π.

3 0

3 years ago

One angle of an isosceles triangle measure 30*. Which other angles could be in that isosceles triangle? Choose all that apply.

Elodia [21]

Answer: 75 degrees

Step-by-step explanation:

75+75+30=180

5 0

3 years ago