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3 years ago

Three-quarter of a number is 15 work out four-fifths

Mathematics

2 answers:

Elodia [21]3 years ago

6 0

Answer:

Step-by-step explanation:

let the number be m.

3/4xm=15

3m=15×4

3m=60 (divide both sides by 3)

m=20

the number is 20.

Vsevolod [243]3 years ago

3 0

Original number is 20, so 4/5= 16

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Caleb is putting tile down in his bathroom and needs to know the perimeter of the floor. Two sides rectangular floor are 5 1/3 f

ladessa [460]

Answer:

20 1/6 ft

Step-by-step explanation:

The perimeter is the sum of the lengths of the sides:

2×(5 1/3 ft) + 2×(4 3/4 ft) = 10 2/3 ft + 8 6/4 ft

= 10 2/3 ft + 9 2/4 ft . . . . change 6/4 ft to 1 1/2 ft

= 10 8/12 ft + 9 6/12 ft = 19 14/12 ft . . . . . use common denominator of 1/12 ft

= 20 2/12 ft . . . . . . change 14/12 ft to 1 2/12 ft; next reduce that fraction

= 20 1/6 ft . . . . perimeter of Caleb's bathroom

4 0

3 years ago

What is the mass of a 15cm cube of lron if density of iron is 78grams/cm

amm1812

Answer:

M = 1170 g

Step-by-step explanation:

Mass = density × volume

M = p x v

M = 78 x 15

M = 1170 g

3 0

3 years ago

Read 2 more answers

Kim solved the equation below by graphing a system of equations. log base 2 (3x-1) = log base 4 (x+8)

kompoz [17]

Answer:

solution is

$x=1.353,y=1.613$

Step-by-step explanation:

We are given equation as

$log_2(3x-1)=log_4(x+8)$

Firstly, we will find equations

First equation is

$y=log_2(3x-1)$

Second equation is

$y=log_4(x+8)$

now, we can draw graph

and then we can find intersection point

we can see that

intersection point is (1.353,1.613)

so, solution is

$x=1.353,y=1.613$

8 0

3 years ago

Read 2 more answers

SOLVE BY GRAPHING

natka813 [3]

Answer:

x=2 and y=3.

Step-by-step explanation:

Let the one number be x and the other number be y.

ATQ, 2x=1+y and x+y=5. x=2 and y=3.

8 0

3 years ago

3(2+7) - 9 x 7 = 3+8 x 2 x 2 - 4 = 16 ÷ 2 x 5 x 3 ÷ 6 = Please answer! ✨✨

Thepotemich [5.8K]

Answer:

At first, we have 3 expressions that are equal.

$3(2+7) - 9 \cdot 7= 3+8 \cdot 2 \cdot 2 - 4$

$6+21 - 63= 3+32 - 4$

$-36=31$

$-36\neq 31$

This is not true.

3 0

3 years ago