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KiRa [710]
3 years ago
10

How many minutes did he spend on homework in all????? Plzzzz helppppp

Mathematics
2 answers:
skelet666 [1.2K]3 years ago
8 0
50 minutes in total spent doing homework
Lorico [155]3 years ago
6 0
It will take 50 minutes
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a student writes "the difference between 15 and the product of 5 and y" to describe the expression 5y-15.Explain the error.
ser-zykov [4K]
The word 'difference' indicates the use of subtraction in a Mathematical sum

The error is that the sum could be 15 - 5y instead of 5y - 15

A subtraction sum does not have the commutative properties, meaning that we cannot do the sum in any order. 

A sum 15 - 5y will give a different result with the sum 5y - 15 for the same value of y.
7 0
3 years ago
Find an equation of the plane that contains (3, 4, −9) and is parallel to x + y − 5z = 1. (Use x, y, and z for coordinates.)
emmainna [20.7K]

Answer:

x + y - 5z = 52

Step-by-step explanation:

Given data:

Point on the plane (3,4,-9)

parallel to x + y -5z = 1

Finding the normal vector

(1 , 1 , -5)(x, y , z) = 1

the normal vector is (1 , 1 , -5)

<em>formula for finding equation the plane given the normal vector (a,b,c) and point (m,n,o) is as </em>

<em>a(x - m) + b(y - n) + c(z-o)=0</em>

Substituting the data we have

1(x-3) + 1( y- 4) - 5(z+9) =0

x-3 +y -4 -5z -45 = 0

x + y - 5z = 45 +4 +3

x + y - 5z = 52

6 0
3 years ago
The radius of a circle is 8.6 centimeters.
max2010maxim [7]
A=pi times r2 so you would do 3.14 times 8.6 ^2 and your answer would be 232.35
5 0
3 years ago
Solve the system by using matrices.<br> X = 4<br> X + y = -6<br> 4x - 3y + 2z = 26
Viktor [21]

Answer:

x=4, y=-10, z=-10

Step-by-step explanation:

7 0
3 years ago
Mary is twice as old as Helen’s age, If 8 is subtracted from Helen’s Age and 4 is added to Mary Age? Mary will be 4 times as old
erik [133]

Answer:

set mary is x years old, and helen is y years old.

first sentence:x=2y

second one:4(y-8)=x+4

bring x=2y in 4(y-8)=x+4

=>4y-32=2y+4

=>2y=36

=>y=18

=>x=36

mary:36

helen:18

3 0
3 years ago
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