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3 years ago

In a group of 60 children there are three times as many boys as girls.how many girls are there

1 answer:

3 0

3 times as many boys as girls, so write it in the ratio 3:1 (Three boys for every one girl)
Add up all the numbers in the ratio (3 + 1 = 4)
Divide the total number of children (60) by the number you just worked out (4)
Multiply the resulting number (60/4 = 15) by the ratio of girls (1)
15 * 1 = 15, there were 15 girls in the class (And so 45 boys)

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Please help this is due worth 22 points

olga nikolaevna [1]

Answer:

1 is

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2 years ago

If f(x) = 3x2 and g(x) = x+2, find (f•g)(x).

Alecsey [184]

Since you have provided me with • symbol I must assume it's about function multiplication, but since standard keyboard doesn't have the function composition symbol $\circ$ I must assume you meant either.

1. Case you meant multiplication.

$(f\cdot g)(x)=3x^2\cdot(x+2)=\boxed{3x^3+6x^2}$

2. Case you meant composition.

$(f\circ g)(x)=f(g(x))=f(x+2)=3(x+2)^2=\boxed{3x^2+12x+12}$

Hope this helps. Next time please use LaTeX to format your equations so that others can give you answers as well.

5 0

3 years ago

Chemists use pH as a measure of acidity or alkalinity of a solution. It uses the concentration of hydrogen ions H+ in a logarith

SpyIntel [72]

Answer:

$g(f(d)) = -dlog_{10}(0.5 * 10^{-4})$

Step-by-step explanation:

Given

$f(d) = (0.5 * 10^{-4})^d$

$g(H+) = -log_{10}(H+)$

Required

Find the composite function g(f(d))

We have:

$g(H+) = -log_{10}(H+)$

Substitute f(d) for H+

$g(f(d)) = -log_{10}(f(d))$

Substitute $f(d) = (0.5 * 10^{-4})^d$

$g(f(d)) = -log_{10}((0.5 * 10^{-4})^d)$

Apply law of logarithm

$g(f(d)) = -dlog_{10}(0.5 * 10^{-4})$

Hence, the function is:

$g(f(d)) = -dlog_{10}(0.5 * 10^{-4})$

7 0

2 years ago

Read 2 more answers

What is the factored form of n2 – 25?

lesantik [10]

Answer: (n + 5)(n - 5)

Explanation: In this problem, we have a binomial that's the difference of two squares because n² and 25 are both perfect squares and we are subtracting or taking the difference of these two squares.

Since the difference of two squares factors as the product of two binomials, we can setup our parenthses and in the first position, we use the factors of n² that are the same which are n · n.

In the second position, we use +5 and -5 as our factors of -25.

So our answer is (n + 5)(n - 5).

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3 years ago

Edgar is walking 0.5 m/s toward the back of a train that is traveling forward at

Ilya [14]

Answer:

12.

Explanation:

6.0m/s devide it by 0.5m/s is 12.

Hope it helps. Please mark me as brainliesttt

6 0

2 years ago