2,575 Answered Questions for the topic Maths

Maths

02/28/19

the square of a number equals nine times that number. find the number

Maths Calculus

02/28/19

How do you find generalized equations when optimizing using calculus?

We have a homework question that we're struggling with and can't seem to find answers to.The problem involves minimizing lengths of strapping used to fasten different boxes down.The box is always... more
Maths Math Science

02/27/19

HELP! PROBLEM SOLVING QUESTION INVOLVING 2 TRAINS! ASAP!!!

Train A departs from a station and travels at a constant speed. Train B departs 2 hours from the same station, travelling at 60km/h. If it catches up with Train A in 4 hours after departing, what... more
Maths Algebra 2

02/26/19

How to calculate what percentage A is of B...without knowing what B is

So for my maths class we are doing some revision, i am having a bit of trouble understanding how to find principle; i just can't find an explanation of how 900 divided by 0.18 is 5,000 in short, i... more

The height of a triangle is 3 cm less than its base. The area of the triangle is 90 square cm. Find the base of the triangle.

so I think I have the answers BUT it doesn't match 90 square cm. The answers were base: -15, 12. Height: -18, 9. However, it does equals to -90 IF 1/2 x -15 x 12 but it's negative. 😭😭
Maths

02/24/19

I need help with math

Neil has a total of twelve $5 and $10 bills in his wallet. He has5 times as many $10 bills as $5 dollar bills. How many of each does he have?
Maths Algebra 2

02/22/19

An investor invested some money at 7% and some money at 5%. If the yearly interest on both investments is the same and the total amount of the investments is $12000...

An investor invested some money at 7% and some money at 5%. If the yearly interest on both investments is the same and the total amount of the investments is $12000, find the amount of each... more
Maths Geometry

02/21/19

math calculations

In triangle​ ABC, the size of angle B is 4times the size of angle​ A, and the size of angle C is 18degrees less than 5times the size of angle A.Find the size of the angles.
Maths Prealgebra

02/18/19

What is the LCM of 5,6 and 7

02/17/19

how do i deduce the moles of the acid reacted with sodium carbonate

The balanced equation is: Na2CO3 + 2HCl ----> 2NaCl + H2O + CO2Moles of sodium carbonate: 0.03945average volume of acid added: 26.3 cm3Acid = HClThis is standardisation of an acid (titration 1)
Maths

02/17/19

simultaneous equation grade 10

I need help with the working out on this equation because I always end up with -30x=4.The equations are: -3x-2y=-12 and y=5x-20/3The answer is meant to be x=4 and y=0
Maths

02/16/19

urgent help for maths

The domain of f is the set A = {−2, −1, 0, 1, 2}. Write the function as a set of ordered pairs. (Use the notation, {( , ), ( , ), ...}, to give your answer.)f(x)= 3x/ x^2+4
Maths Prealgebra

02/15/19

a parts dilemma

A food preparation has 37 ingredients. of this, 27 ingredients are in 3 parts, 6 ingredients in 12 parts, 1 ingredient in 24 part, 1 ingredient in 48 and 2 ingredients in 96 parts. How do I crack... more
Maths Algebra 1

02/13/19

Maths - Surds Circle AREA

https://prnt.sc/mkq77w - Screenshot with Picture for QuestionHelp ASAP, Much appreciated

02/13/19

Include all the quantities required, concisely describe how you would make 50mL of a 0.5% (w/v) solution of BSA (molecular weight: 66 400) using water as a diluent

Include all the quantities required, concisely describe how you would make 50mL of a 0.5% (w/v) solution of BSA (molecular weight: 66 400) using water as a diluent

02/13/19

Help finding length knowing angles

The angle of elevation of the sun is 64. A telephone pole that is inclined at an angle of 9 degrees (with the vertical) casts a shadow of 5.25 m on the ground. Calculate the approximate length of... more
Maths

02/13/19

-3(2y+3)-1=-4(y+6)+2y

Maths

02/11/19

I wanna know how to calculate this Probability

Alex keeps throwing a fair die until he gets a even number..Find the probability that his last dice is numbered ‘ 2 ’.
Maths

02/09/19

maths problem ratio

Sarah and Henry share some sweets in the ratio 7:6 . Sarah eats 24 of her sweets and the ratio of sweets left becomes 1:2 . How many sweets did Henry have?
Maths Physics

02/08/19

Addition of Mass and conversion to grams

We have the following masses: 20,000,000 kg; 5,000 dg; 650mg. What is the total mass in grams?

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