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5x+3 = 18. What is the value of x?

Take away 3 from both sides to give you : 5x = 15Divide by 5 on both sides to give you : x = 3
JB
Answered by Joseph B. • Maths tutor
3840 Views

Solve the quadratic equation: x^2 - 2x - 15 = 0

To solve this, you need to find two factors of -15 that total to give -2. The solution we're looking for is of the for (x + something) (x + something)=0, as you can then solve each bracket to get two results...
JH
Answered by James H. • Maths tutor
5849 Views

What is the value of tan(45)?

From our base right angled triangle (base and height of 1) and remembering SOH CAH TOA ( tangent = opposite/adjacent), we can deduce tan(45) = 1 / 1 = 1
BS
Answered by Bernardo S. • Maths tutor
6566 Views

There are 720 boys in a school and 700 girls. The probability that a girl chosen at random studies french is 3/5 and the probability that a boy chosen at random studies french is 2/3. What is the total number of students in the school that study french?

The probability that a girl chosen at random studies french is 3/5. This means that out of 700 girls at the school, three fifths (3/5) girls study french. To find out how many girls study french we must find...
ZP
Answered by Zoe P. • Maths tutor
4092 Views

Solve by factorisation. 3x^2 + 11x – 20 = 0

Factorisation is a skill learned through a lot of practise. For questions with a coefficient of x, I like to use the 'House Method'.Step 1 - multiply the coefficient of x 2 with the constant. =3*(-20)=-60Ste...
PP
Answered by Peter P. • Maths tutor
8962 Views