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katen-ka-za [31]
3 years ago
6

Geoffrey and his babysitter spent 20 minutes preparing dinner, 2 hours and 30 minutes playing board games, and half an hour maki

ng dessert. How many minutes did they spend doing these activities?
Mathematics
2 answers:
harkovskaia [24]3 years ago
6 0
200 minutes 
20 + 60 + 60 + 30 + 30 = 200
Pavel [41]3 years ago
6 0
This is very simple!!
.
Don't worry, no need to panic.
.
Just add the number of minutes up!!
.
Write the numbers that you can see are evident down.
.
20... 2 hours and 30 minutes... no more.
.
BUT WAIT!! 
.
Half an hour looks suspicious.
.
Isn't that 30 minutes?
.
Add that to our list.
.
Now, we have to convert 2 hours to minutes.
.
Arggggh!!
.
Don't worry, there's 60 minutes in an hour, so 60 x 2 is 120 minutes!!
.
Add em' up!!
.
20 + 120 + 30 + 30 is...
.
200 minutes!!
.
Or, 3 hours and 20 minutes.
.
Hope I helped!!
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A recipe uses 1/4 teaspoon of salt and 2 1/2 teaspoons of sugar. What is the ratio of salt to sugar in this recipe?​
KATRIN_1 [288]

Answer:

1:10

Step-by-step explanation:

the ratio we can it is

\frac{amount\:salt}{amount\:sugar}\\\\\frac{\frac{1}{4}}{2\frac{1}{2}}\\\\\frac{\frac{1}{4}}{\frac{5}{2}}\\\\\frac{1\times2}{4\times5}\\\\\frac{1}{2\times5}\\\\\frac{1}{10}

so the ratio is 1:10

5 0
2 years ago
The ratio of two numbers is 4:9. When 5 is subtracted from each of them the new ratio becomes 3:8. Find the numbers.​
natta225 [31]

Answer:

FIRST NUMBER IS 20

AND

SECOND NUMBER IS 45

Step-by-step explanation:

LET THE RATIO BE X

FIRST NUMBER = 4X

SECOND NUMBER = 9X

A/Q,

=}4X - 5 / 9X - 5 = 3 / 8

CRISS CROSS,

=}8 ( 4X - 5 ) = 9X - 5 ( 3 )

=}32X - 40 = 27X - 15

=}32X - 27X = - 15 + 40

=}5X = 25

=}X = 25 / 5

=}X = 5

THEREFORE,

FIRST NUMBER

=} 4X

=} 5 × 4

=} 20

SECOND NUMBER

=} 9X

=} 5 × 9

=} 45

8 0
3 years ago
How many decimal places are in 0.0050
zavuch27 [327]

Answer:

HERE IS YOUR ANSWER

Step-by-step explanation:

4

8 0
3 years ago
Read 2 more answers
Find the matrices of the following linear transformations
Sidana [21]

Answer:

The matrixes are in the explanation box.

1. A mapping of (x,y,z) to (x,y,0)

2. Is a mapping of (x,y,z) to (-x,-y,z)

Step-by-step explanation:

We have the orthogonal projection onto the cy-plane to be a mapping of (x,y,z) to (x,y,0). Then we will have a transformation matrix that has the form below.

[1 0 0]

[0 1 0]

[0 0 1]

For the reflection in the z-axis,it is a reflection of (x,y,z) to (-x,-y,z). Our matrix will then have the form below

[-1 0 0]

[0 -1 0]

[0 0  1]

4 0
2 years ago
4. Algebra If in one year a city
vredina [299]

Answer:

268.25

Step-by-step explanation:

by using the fact that one year is 365.25 days, we can subtract our 365.25 by our 97 to get 268.25, written in the equation of 365.25-97=268.25

*edit, messed up how long a year was, corrected my issue, answer & equation.

7 0
2 years ago
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