MATHEMATICS HIGH SCHOOL

Lisa is seven times as old as her brother. She will be four times as old as her brother in three years. Represent the above situation in mathematical form.

Answers

Answer 1

Answer:

Answer:

Let B = the brothers age now

Let L = Lisa's age now

Then today:

L = 7B

And three years from now, Lisa's current age plus 3 equals 4 times the brothers age plus 3 represented by the following formula

L+3 = 4(B+3)

Now we can substitute the value of L in the first formula for L in the second formula

7B + 3 = 4(B+3)

So the answer is C

Step-by-step explanation:

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Seven tenths of a number plus fourteen is less than forty-nine

Answers

I'm going to assume you need this inequality solved.

First, write it as numbers, not words.

7/10n + 14 < 49

where "n" is the unknown number.

Second, if I were you, I'd change that fraction into a decimal, as it'll make life easier later on.

7/10 = 0.7

Now, solve it like you would any other equation.

0.7n + 14 < 49

0.7n +14 - 14 < 49 - 14

0.7n < 35

0.7n ÷ 0.7 < 35 ÷ 0.7

n < 50

The answer is n < 50

If f(x) = 1 – x, which value is equivalent to |f(i)|?a. 0
b. 1
c. √2
d. √-1

Answers

If you would like to know which value is equivalent to |f(i)|, you can calculate this using the following steps:

f(x) = 1 - x
|f(i)| = |1 - i| = sqrt((1-i) * (1-i)^conjugate) = sqrt(2) = √2

The correct result would be c. √2.

Answer:

The answer is c

Step-by-step explanation:

Yancey collects plastic banks .He has three different banks: a pig, a cow, and a horse. How many ways can Yancey arrange his banks on a shelf.

Answers

let h = horse, let c = cow, let p = pig

so,

hcp

hpc

cph

chp

phc

pch

so, that is 6 different ways she can arrange it.

pig, cow, horse

pig, horse, cow

horse, pig, cow

horse, cow, pig

cow, pig, horse

cow, horse, pig

Earlier this year in a drug bust in Shanghi, China, police seized 2.4 tons of methamphetamines. If a typical dosage is 50mg, how many doses is that bust, which the Chinese police prevented from being sold to the public?

Answers

2.4 tons=2.4 tons*(1,000 Kg / 1ton)*(1,000,000 mg / 1 kg)=
=2,400,000,000 mg=2.4 x 10⁹ mg

Now, we solve this problem by the rule of three.

50 mg ---------------------1dose
2.4x10⁹ mg---------------- x

x=(2.4 x 10⁹ mg * 1 dose) / 50 mg=48,000,000 doses.

Answer: 48,000,000 doses

1.4/7`in simplest form

Answers

$(1.4)/(7)=(1.4\cdot10)/(7\cdot10)=(14)/(70)=(14:14)/(70:14)=(1)/(5)$

1.4 / 7
Multiply by ten to get rid of the decimal. So...
14/70
Then divide each by 2
7/35
But you can divide it again. So divide it by its greatest common factor, which is 7. So....
1/5.
1/5 is your final answer.

HELP ME PLS PLS PLSZLZLDBFKSBJZBABS

Answers

Answer:

Step-by-step explanation:

0< $(769000)/(23)$

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