2 years ago

If z varies directly as x and z=30 when x=8 fine z when x=4

Mathematics

1 answer:

Lelechka [254]2 years ago

5 0

So for this one all you have to do is use the formular

Z*k=x

30k=8

K=4/15

Then when x=4

4/15x=4

So x=15

You might be interested in

You are baking cupcakes for your class. There are 30 total students in your class and you have baked 15 cupcakes. Write and solv

fiasKO [112]

the answer is 75 because 30*3 -15 =75

7 0

3 years ago

Write the quadratic equation whose roots are 3 and -1, and whose leading coefficient is 5.

Assoli18 [71]

Answer:

5x² - 10x - 15 = 0

Step-by-step explanation:

Given that the roots are x = 3 and x = - 1, then the factors are

(x - 3) and (x + 1) and the quadratic is the product of the factors, that is

f(x) = a(x - 3)(x + 1) ← a is a multiplier

Here a = 5, thus

f(x) = 5(x - 3)(x + 1) ← expand factors using FOIL

= 5(x² - 2x - 3) ← distribute parenthesis by 5

= 5x² - 10x - 15

Thus equation is

5x² - 10x - 15 = 0

6 0

3 years ago

What's the answer for 18.9 hundred ninety four rounded to the nearest hundreds

ira [324]

So 194 will round to 200

8 0

2 years ago

Read 2 more answers

Esteban wants to take out a $5,000 loan from the bank and is offered two choices. If he pays the loan back within 3 years, he wi

castortr0y [4]

Answer:

ESTEBAN IS FOKING BROKE

Step-by-step explanation:

8 0

2 years ago

An alloy is composed of nickel, zinc, and copper in a 7:2:9 ratio. How many kilograms of each metal is needed to make 3.8 kg of

Tamiku [17]

Ni : Zn: Cu = 7:2:9 =7x : 2x : 9x

7x+2x+9x = 3.8
18x=3.8
x=3.8/18=1.9/9≈0.21

Ni: 7x=7*0.21=1.47 ≈1.5 kg
Zn: 2x=2*0.21=0.42≈0.4 kg
Cu: 9x=9*0.21=1.89 ≈1.9 kg

Check 1.5+0.4+1.9 =3.8 True

6 0

2 years ago