Ask question

Ask question

All categories

3 years ago

15

Guy decides to get in shape by running. The first day, he runs 1 mile in 12 minutes. Two months later he has decreased his mile

time by 25%. What is his mile time now? 6 minutes 7.5 minutes 8 minutes 9 minutes

1 answer:

Tcecarenko [31]3 years ago

8 0

Answer:

$25 \div 100 \times 12 = 3$

$12 - 3 = 9$

$= 9minutes$

You might be interested in

Solve the equation for y. 4.2x-1.4y=2.1

mr Goodwill [35]

Subtract 2.1 from both sides:

$4.2x-1.4y-2.1=0$

Add 1.4y to both sides:

$4.2x-2.1=1.4y$

Of course, we can rewrite this as

$1.4y=4.2x-2.1$

Divide both sides by 1.4

$y = \dfrac{4.2}{1.4}x - \dfrac{2.1}{1.4} = 3x - 1.5$

8 0

3 years ago

One half of the sum of r and 2

hjlf

(r + 2) ÷ 1/2

Hope this helps you

Brainliest would be appreciated!

-AaronWiseIsBae

8 0

3 years ago

a metalworker has meal alloy that is 15% copper and another alloy that is 60% copper. how many kilograms of each alloy should th

iragen [17]

Let L be the low copper alloy and H be the high copper alloy.
We need 0.15L + 0.60H = 0.42 and L + H = 100

L=100 - H
Substituting this into the second equation for L, we get:
0.15(100-H) + 0.60H = 0.42(H+L)
15 - 0.15H + 0.60H = 0.42(H+100-H)
15 + 0.45H = 0.42(100)
0.45H = 42 - 15 = 27
H = 27/.45 = 60 lbs

Back substitution, L = 40 lbs.

4 0

3 years ago

The length of a lacrosse field is 15 yards less than twice the width, and the perimeter in 270 yards. The defensive area of the

sammy [17]

The defensive area is 510 square yards

Step-by-step explanation:

Let L be the length of the rectangle

and

W be the width

According to given statement

L = 2W-15

Perimeter = 270

$P = 2W+2L\\270 = 2W + 2(2W-15)\\270 = 2W + 4W -30\\270 +30 = 6W\\6W = 300$

Dividing both sides by 6

$\frac{6W}{6} =\frac{300}{6}\\W = 50\ yards\\\\and\\L = 2(50) -15\\= 100-15\\=85\ yards$

We have to find the area first to find the defensive area

So,

$Area = L* W\\= 85 * 50\\=4250\ square\ yards$

Defensive area = 3/25 of total area

So,

$=\frac{3}{25}*4250\\=3 *170\\=510\ square\ yards$

Hence,

The defensive area is 510 square yards

Keywords: Area, Rectangle

Learn more about area at:

#LearnwithBrainly

5 0

3 years ago

Write the fraction in simplest form 25/100

gregori [183]

25/100 is divisible by 25, so the simplest form is 1/4

8 0

2 years ago

Read 2 more answers