Ask question

Ask question

All categories

2 years ago

14

There are 150 students in band and 90 students in chorus. 1/2 of band members and 4/5 of chorus helped in charity concert. How m

any more band members than chorus members participated

1 answer:

julia-pushkina [17]2 years ago

3 0

Answer:

3

Step-by-step explanation:

You might be interested in

Ax+by=(a-b) , bx - ay =(a+b) simultaneous linear equations using cross multiplication

Molodets [167]

Answer:

$x=1\,,\,y=-1$

Step-by-step explanation:

Given: $ax+by=a-b\,,\,bx-ay=a+b$

To solve: the given linear equations

Solution:

Consider the equations:

$A_1x+B_1y+C_1=0\\A_2x+B_2y+C_2=0$

By method of cross multiplication:

$\frac{x}{B_1C_2-B_2C_1}=\frac{y}{C_1A_2-C_2A_1}=\frac{1}{A_1B_2-A_2B_1}$

For equations: $ax+by=a-b\,,\,bx-ay=a+b$

$ax+by-(a-b)=0\\bx-ay-(a+b)=0$

Take $A_1=a\,,\,B_1=b\,,\,C_1=-(a-b)\,,\,A_2=b\,,\,B_2=-a\,,\,C_2=-(a+b)$

So,

$\frac{x}{-b(a+b)-a(a-b)}=\frac{y}{-b(a-b)+a(a+b)}=\frac{1}{-a^2-b^2}\\\frac{x}{-ab-b^2-a^2+ab}=\frac{y}{-ab+b^2+a^2+ab}=\frac{1}{-(a^2+b^2)}\\\frac{x}{-(a^2+b^2)}=\frac{y}{a^2+b^2}=\frac{1}{-(a^2+b^2)}\\\frac{x}{-(a^2+b^2)}=\frac{1}{-(a^2+b^2)}\,,\,\frac{y}{a^2+b^2}=\frac{1}{-(a^2+b^2)}\\x=1\,,\,y=-1$

6 0

2 years ago

2000 tickets were sold in exhibit on Saturday the cost of a ticket for an adult is four dollars and for a child is two dollars a

PolarNik [594]

Answer:

look at picture

Step-by-step explanation:

x: adult tickets

t: children tickets

8 0

3 years ago

In his free time, Gary spends 7 hours per week on the Internet and 8 hours per week playing video games. If Gary has five hours

77julia77 [94]

Answer:

D. 30%?

I'm not 100% sure but I think its D. Sorry if it's wrong.

3 0

2 years ago

A diver went 37.9 feet below the surface of the ocean, and then 12.4 feet further down, he then rose 8.16 feet. Write and solve

klemol [59]

(37.9 + 12.4) + 8.16 i think, i could be wrong though.

8 0

2 years ago

Read 2 more answers

-3(4s-1)-3=-3(6s+6)-3

OlgaM077 [116]

Answer:

I think its 6 not sure

Step-by-step explanation:

5 0

2 years ago