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bezimeni [28]
3 years ago
8

Find the percent increase from the first number to the second in the following pairs.

Mathematics
1 answer:
kifflom [539]3 years ago
5 0
A. 40%
B. 56.25%
C. 33.3333%
D. -88.8888%
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One year ago liz was three times as old as her brother jack. in two years she'll be only twice as old as jack. how old are liz a
iren2701 [21]

L = liz's age now

J = Jack's age now

L-1 and J-1 are their ages one year ago

L-1=3(J-1)

L-1=3J-3

L=3J-3+1

L=3J-2 (to be used later)

L+2 and J+2 are their ages in two years

L+2=2(J+2)

replace L by 3J-2

3J-2+2=2(J+2)

3J=2J+4

3J-2J=4

J=4 is Jack's age now

L-1=3(J-1)

L-1=3(4-1)

L-1=3*3

L-1=9

L=9+1

L=10 is Liz's age now

4 0
3 years ago
Oscar invests $20,000 in three investments earning 6% ,8% and 10%. He invests $9000 more in the 10% investment than in the 6% in
Hatshy [7]
This problem is mainly concerned with setting up an equation.

let's add the interest rates times their respective investment amounts:

a = (9000 + x)0.10

b = x \times 0.06

c=(20000 - ((9000 + x) + x)) 0.08

simplify:

c = (11000 - 2x) \times 0.08

sum of interest:

1780 = a + b + c

1780 = (9000+x) 0.10 + x 0.06 + (11000-2x)0.08

1780 = 1780 + 0 \times x

0=0

solution:

He does not have any invested in the 6%, while he has 9000 invested at 10% and 11,000 invested at 8%

to check:

9000 \times 0.10 + 11000 \times 0.08

= 900 + 880 = 1780

So this ended up being a trick problem because he does not actually have any invested in the 6% option.
6 0
4 years ago
Determine an equation in simplified form for the family of quartic functions with zeros at 1, -4, (-2+i) and (-2-i). Give your a
k0ka [10]
Hello :
an equation : 
(x-1)(x+4)(x+2-i)(x+2+i)
7 0
3 years ago
during a hot summer week the water level in wei's pool decreased by 1.9 centimeters. wei added water to the pool increasing the
tangare [24]
First week : -1.9 + 3.5 = 1.6
2nd week : -2.4

original water level had an increase of 1.6 inches
new water level has a decrease of -2.4 inches
7 0
4 years ago
Read 2 more answers
Two boats leave the same dock in Cairo, Illinois, at the same time. One heads north on the Mississippi River whole the three hea
Alenkasestr [34]

Answer:

4.5 hours

Step-by-step explanation:

Every hour they grow 12 miles part.

54/12=4.5

6 0
3 years ago
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