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The way to choose two types of cheese - 8*7/2 or 28

28*10 is 280

4x-3x=18

x=18

Adam - 72

Sally - 54

An international airport sells scarves for 19 US dollars, 150 Hong Kong dollars, 130 South African rand, or 14 euros. If the current exchange rate is 1 US dollar = 8 Hong Kong dollars = 7 South African rand = 0.7 euros, which currency is the best deal for customers?

150/8=18.75 USD for hong kong

130/7= 18 4/7 USD for rand

14*10/7=20 USD for euros

the rand is

I mean i dont know much about it myself since geo is my worst subject

But It should be that the smallest side of a triangle is opposite to the smallest angle in a triangle

I can start on the first question...

The shortest side would be the one across from the smallest angle since the larger the angle, the opposite side gets bigger in comparison to the others. (just look at a right triangle)

right, messed up there

Say my age back then is x

So my moms back then was 7x

In 8 years, we add 15.

So 7x+15 and x+15

7x+15 is two times x+15

So 7x+15 equals 2x+30

5x=15

x=3

So back then your mother was 21.

Checking work

21+15=2(3+15)

Simplifying we get x<=17

So the interval notation would be (-inf,17]

If we multiply all of them together we get a^3*b^3*c^3*d^3=27000.

The square root of that is a*b*c*d=30.

We can independently solve for each number with the above equations.

So a=1, b=3, c=5, and d=2.

1+3+5+2=11.

Say we have 48 giraffes and 40 apes

THen we would have 5 zebras

The GCD of these numbers is 1, so we cant simplify these numbers anymore

SO the zoo has 5 zebras