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We have 2 spinners: spinner A and spinner B. Spinner A can land on 2, 3, 5 or 7. Spinner B can land on 2, 3, 4, 5 or 6. Spin both. Win if one spinner lands on odd and the other lands on even. Play game twice, what is the probability of winning both games?

P(win 2 out of 2 games) = P(win first game and win second game) = P(win first game)^2. So want to find the probability of winning a game.To win, either we need A odd and B even or we need A even and B odd...

Answered by Henry C. • Maths tutor

7510 Views

Simplify (2x+3)^2 - (2x +3)(x-5). Give your answer in the form ax^2 +bx +c

Break this down into two parts.
a. Multiply out the 1st bracket, (2x+3)^2: This goes to (2x+3)(2x+3) which is equal to 4x^2 + 9 +6x+6x . Collect the like terms to get 4x^2 +12x +9.
b. Multiply...

Answered by Kenji S. • Maths tutor

8656 Views

Why does this past tense verb take être instead of avoir like the others?

There are two groups of verbs in French which use être in the passé composé rather than avoir. The first group are the reflexive verbs (think of the morning routine verbs se laver, se lever, se doucher) a...

Answered by Genevieve S. • French tutor

1719 Views

Sketch a curve of f(x)= sin(x)/x

Start by analysing the parts of the function, it's clearly a combination of two functions: f = g(x) / h(x) and drawing them both out.Examine behaviour for -inf. and +inf.Notice a problem in a situation wh...

Answered by Maciej P. • Oxbridge Preparation tutor

1870 Views

Sodium hydroxide reacts with phosphoric(V) acid according to the equation: 3NaOH + H3PO4 -> Na3PO4 + 3H2O 25.00 cm3 of 0.10 mol dm-3 sodium hydroxide reacts with 0.05 mol dm-3 H3PO4. The volume of H3PO4, in cm3, required for neutralisation is?

This is a simple moles equation and the method with any moles equation is find the number of moles of something, use the chemical equation to work out the number of moles of the thing you need to find and...

Answered by Matthew E. • Chemistry tutor

15164 Views